bluuebunny/crossref_metadata_2025 huggingface dataset:
Revisiting the face stability of rock tunnels in the Hoek–Brown strength criterion with tension cutoff
Authors: Zhong Junhao , Chian Siau Chen , Chen Hui , Hou Chuantan , Yang Xiaoli
Published: March 2024

In this work, the three‐dimensional stability of deep tunnel faces is evaluated in rock masses characterized by the generalized Hoek–Brown (H–B) criterion from the perspective of the limit analysis theorem. Considering that underground engineering is gradually developing towards larger burial depths and larger sizes, and the tensile strength of rocks is usually overestimated, the concept of tension cutoff (T‐C) is introduced to substitute the parabolic form of the H–B envelope in the tensile region with a circular arc. The multitangent technique is used to piecewise approximate the H–B envelope, instead of the conventional linear substitution, accounting for the nonlinear dependence of the shear strength on the pressure. Meanwhile, the earthquake loading is considered by the classic pseudostatic method. The tunnel face stability is measured by a stability number, which is calculated based on a newly developed multicone failure mechanism. Parameter studies indicate that the T‐C has almost no impact on the critical support pressure, while has a significant effect on the critical stability number, especially in the presence of earthquakes. Nearly all stress points back‐calculated from the rupture angles fall within the T‐C region, except for the first stress point associated with the first segment. Interestingly, the influence of the geological strength index (GSI) on the face stability is inverse to that of mi due to the brittleness of rocks. Moreover, the critical stability number is not sensitive to mi, but sensitive with the introduction of earthquake loadings.
Biodegradable polymer films: processability, technological properties and their viability for flexible packaging applications
Authors: Morreale Marco , Baiamonte Marilena , Correnti Antonio , Messina Sergio , La Mantia Francesco Paolo
Published: March 2024

Nowadays, there is a rising interest in the packaging industry regarding more environment‐friendly (i.e. biodegradable and/or compostable) polymer‐based solutions, especially for film blowing applications. However, replacing traditional, fossil resource‐based polymers typically used for such applications is not an easy task, since the more environment‐friendly solutions must have adequate features in terms of processability and final properties. In this work, three commercial biodegradable (and, at least partially, biobased) polymers were investigated by a preliminary rheological and mechanical analysis, in order to perform film manufacturing experiments in laboratory equipment. Furthermore, oxygen and water vapour barrier properties were studied by permeability measurements. The investigation was ultimately performed on films produced in industrial equipment, and the results were compared to those for a typical, standard polypropylene (PP) film used in flexible packaging applications. It was found that the mechanical properties were adequate (in some cases, even up to 25–30% higher than for the PP counterpart), as well as oxygen permeability. On the other hand, water permeability was significantly higher than that of PP films, and this should be taken into account in cases where high water vapour barrier properties are required. © 2024 Society of Industrial Chemistry.
School psychologists' training and experience in providing grief support
Authors: Brown Jacqueline A. , Snider Kara M. , Hall Hannah G. , Rotzal Jennifer L. , Gow Morgan M.
Published: March 2024

School‐based mental health professionals consistently report that they are either not prepared to support grieving students, or do not have time to integrate crisis intervention support into their hectic schedule. Given that inadequate school mental health services can increase a bereaved student's risk of developing emotional problems, it is critical that school psychologists increase their comfort in grief. This study surveyed 75 school psychologists in the Northwestern United States regarding their training and experience in grief support. A reflexive thematic analysis identified four themes related to the challenges and recommendations in grief support: lack of training, limited role of the school psychologist, lack of formalized grief response system, and lack of school and community resources. Furthermore, only 3% of participants reported taking the lead in providing grief support and 64% provide grief support fewer than five times a year. The majority (81%) reported that they had zero courses devoted to grief support during their graduate degree, with more participants (67%) obtaining grief training postdegree. Study limitations, areas for further research, and implications for schools and school psychologists are also discussed.
VPBrowse: Genome‐based representation of MS/MS spectra to quantify 10,000 bovine proteins
Authors: Paramasivan Selvam , Ashick Mohamed , Dudley Kevin J. , Satake Nana , Mills Paul C. , Sadowski Pawel , Nagaraj Shivashankar H.
Published: March 2024

SWATH is a data acquisition strategy acclaimed for generating quantitatively accurate and consistent measurements of proteins across multiple samples. Its utility for proteomics studies in nonlaboratory animals, however, is currently compromised by the lack of sufficiently comprehensive and reliable public libraries, either experimental or predicted, and relevant platforms that support their sharing and utilization in an intuitive manner. Here we describe the development of the Veterinary Proteome Browser, VPBrowse (http://browser.proteo.cloud/), an on‐line platform for genome‐based representation of the Bos taurus proteome, which is equipped with an interactive database and tools for searching, visualization, and building quantitative mass spectrometry assays. In its current version (VPBrowse 1.0), it contains high‐quality fragmentation spectra acquired on QToF instrument for over 36,000 proteotypic peptides, the experimental evidence for over 10,000 proteins. Data can be downloaded in different formats to enable analysis using popular software packages for SWATH data processing whilst normalization to iRT scale ensures compatibility with diverse chromatography systems. When applied to published blood plasma dataset from the biomarker discovery study, the resource supported label‐free quantification of additional proteins not reported by the authors previously including PSMA4, a tissue leakage protein and a promising candidate biomarker of animal's response to dehorning‐related injury.
In‐Network Quantum Computing for Future 6G Networks
Authors: Urgelles Helen , Maheshwari Shivam , Nande Swaraj Shekhar , Bassoli Riccardo , Fitzek Frank H.P. , Monserrat Jose F.
Published: March 2024

In light of the imperative for expeditious data processing and enhanced global connectivity, the domain of communication technology is experiencing a rapid progression from the Fifth Generation (5G) to the forthcoming Sixth Generation (6G) within the research community. Furthermore, 6G promises to significantly augment the synergy between the human, digital, and physical realms, thereby necessitating the formulation of novel Key Performance Indicators (KPIs) as well as Key Values Indicators (KVIs), and the assimilation of commensurate technologies. Among these technologies, quantum computing is evolving rapidly due to its inherent advantages from quantum mechanics. Nevertheless, scant attention is directed toward a comprehensive exploration of the consequences attendant to its present‐day application. The principal objective of this article resides in its endeavor to underscore, from a compensatory perspective, the convergence of 6G and quantum computing while concurrently considering the Sustainable Development Goals and its KVIs.
Airway obstruction due to mochi (sticky rice cake) retrieved with a cryoprobe
Authors: Kawataki Masanori , Hamakawa Masamitsu , Hayase Momoko , Ishida Tadashi
Published: March 2024

Key message

Cryoprobes represent an option for bronchial foreign body removal in cases of bronchial obstruction due to viscous substances such as mochi at body temperature.
Event‐triggered bipartite consensus for high‐order nonlinear multi‐agent systems with actuator faults
Authors: Qi Yanan , Zhang Xianfu , Mu Rui , Liu Qingrong
Published: March 2024

This article addresses the event‐triggered bipartite consensus problem for high‐order nonlinear multi‐agent systems with antagonistic interactions. Intermittent actuator faults covering bias and partial loss of effectiveness are also investigated. To achieve consensus, a relative‐output‐dependent compensator is constructed based on a time‐varying gain. Subsequently, by integrating adaptive compensation mechanisms as well as an event‐triggered mechanism, an output‐feedback fault‐tolerant consensus protocol is proposed for the sake of fault compensation. It is worth noting that a positive function is embedded in the triggering function to adjust the triggering threshold and exclude the Zeno behavior. Under a signed digraph, it is shown that the designed protocol enables all agents to achieve consensus with opposite signs, even if the total number of unknown faults is infinite. Finally, a simulation is presented to illustrate the validity of the obtained protocol.
Optimal design of time‐varying parameter fractional order controller using ameliorated gazelle optimization algorithm
Authors: Duan Yujie , Liang Jianguo , Liu Jianglin , Li Yinhui , Xie Jiaquan , Zhang Tengda , Feng Zhongwei , Zhao Xiaodong
Published: March 2024

The model parameter uncertainty and controller gain disturbance of the factory servo system are challenges that affect the robustness and control performance of the system. In this paper, a class of factory servo systems with non‐integer order is studied. The stable boundary trajectory method of the fractional order system is used to determine the parameter stability domain that makes the control system stable. An optimal gain trade‐off design method for time‐varying parameter fractional order PID controller () is proposed. The time function is introduced as the adjustment formula to realize the adaptive adjustment of the controller gain. The Lyapunov theorem analyzes the stability of the method. At the same time, an ameliorated gazelle optimization algorithm (AGOA) is proposed to optimize the parameters of the controller, and the weight relationship is changed to set the objective function to obtain the optimal performance combination after optimization. The benchmark function optimization test is completed. Statistical analysis shows that AGOA can enhance the global search ability, prevent the acquisition of local optimum, and have faster convergence speed. The final simulation results show that the proposed scheme is a promising alternative to improve the system control performance.
Ion Transport Behavior in van der Waals Gaps of 2D Materials
Authors: Yang Yahan , Wang Moxuan , He Qianqian , Zhai Pengbo , Zhang Peng , Gong Yongji
Published: March 2024

2D materials, with advantages of atomic thickness and novel physical/chemical characteristics, have emerged as the vital building blocks for advanced lamellar membranes which possess promising potential in energy storage, ion separation, and catalysis. When 2D materials are stacked together, the van der Waals (vdW) force generated between adjacent layered nanosheets induces the construction of an ordered lamellar membrane. By regulating the interlayer spacing down to the nanometer or even sub‐nanometer scale, rapid and selective ion transport can be achieved through such vdW gaps. The further improvement and application of qualified 2D materials‐based lamellar membranes (2DLMs) can be fulfilled by the rational design of nanochannels and the intelligent micro‐environment regulation under different stimuli. Focusing on the newly emerging advances of 2DLMs, in this review, the common top‐down and bottom‐up synthesis approaches of 2D nanosheets and the design strategy of functional 2DLMs are briefly introduced. Two essential ion transport mechanisms within vdW gaps are also involved. Subsequently, the responsive 2DLMs based on different types of external stimuli and their unique applications in nanofluid transport, membrane‐based filters, and energy storage are presented. Based on the above analysis, the existing challenges and future developing prospects of 2DLMs are further proposed.
Decorating Pd–Au Nanodots Around Porous In2O3 Nanocubes for Tolerant H2 Sensing Against Switching Response and H2S Poisoning
Authors: Zhao Xinhua , Du Lingling , Xing Xiaxia , Li Zhenxu , Tian Yingying , Chen Xiaoyu , Lang Xiaoyan , Liu Huigang , Yang Dachi
Published: March 2024

With the recently‐booming hydrogen (H2) economy by green H2 as the energy carriers and the newly‐emerged exhaled diagnosis by human organ‐metabolized H2 as a biomarker, H2 sensing is simultaneously required with fast response, low detection limit, and tolerant stability against humidity, switching, and poisoning. Here, reliable H2 sensing has been developed by utilizing indium oxide nanocubes decorated with palladium and gold nanodots (Pd–Au NDs/In2O3 NCBs), which have been synthesized by combined hydrothermal reaction, annealing, and chemical bath deposition. As‐prepared Pd–Au NDs/In2O3 NCBs are observed with surface‐enriched NDs and nanopores. Beneficially, Pd–Au NDs/In2O3 NCBs show 300 ppb‐low detection limit, 5 s‐fast response to 500 ppm H2, 75%RH‐high humidity tolerance, and 56 days‐long stability at 280 °C. Further, Pd–Au NDs/In2O3 NCBs show excellent stability against switching sensing response, and are tolerant to H2S poisoning even being exposed to 10 ppm H2S at 280 °C. Such excellent H2 sensing may be attributed to the synergistic effect of the boosted Pd–Au NDs’ spillover effect and interfacial electron transfer, increased adsorption sites over the porous NCBs’ surface, and utilized Pd NDs’ affinity with H2 and H2S. Practically, Pd–Au NDs/In2O3 NCBs are integrated into the H2 sensing device, which can reliably communicate with a smartphone.
Full‐mesh VPN performance evaluation for a secure edge‐cloud continuum
Authors: Kjorveziroski Vojdan , Bernad Cristina , Gilly Katja , Filiposka Sonja
Published: March 2024

The recent introduction of full‐mesh virtual private network (VPN) solutions which offer near native performance, coupled with modern encryption algorithms and easy scalability as a result of a central control plane have a strong potential to enable the implementation of a seamless edge‐cloud continuum. To test the performance of existing solutions in this domain, we present a framework consisted of both essential and optional features that full‐mesh VPN solutions need to support before they can be used for interconnecting geographically dispersed compute nodes. We then apply this framework on existing offerings and select three VPN solutions for further tests: Headscale, Netbird, and ZeroTier. We evaluate their features in the context of establishing an underlay network on top of which a Kubernetes overlay network can be created. We test pod‐to‐pod TCP and UDP throughput as well as Kubernetes application programming interface (API) response times, in multiple scenarios, accounting for adverse network conditions such as packet loss or packet delay. Based on the obtained measurement results and through analysis of the underlying strengths and weaknesses of the individual implementations, we draw conclusions on the preferred VPN solution depending on the use‐case at hand, striking a balance between usability and performance.
Thermal Mechanical Behavior and Microstructure Characteristics of As‐Cast FeCrNiAl Steel
Authors: Cui Haotian , Wang Kui , Lv Jingyan , Tian Qingchao
Published: March 2024

To find the suitable deformation temperature range for the as‐cast Fe–5.5Cr–5.5Ni–3.0Al–0.27C high‐strength lightweight steel, the thermal mechanical behavior and the dependent microstructure characteristics are studied to investigate the high‐temperature mechanical response of the steel. In the results, it is shown that the microstructure of the steel owns a dendrite framework consisting of the martensite dendrite and the interdendritic austenite, among which precipitations of NiAl, Ni3Al, and δ‐Fe are induced by high‐temperature deformation. The flow stress dependence of deformation temperature shows two different variation tendencies, corresponding to the varied deformation mechanisms of strain‐induced precipitation of second phases and δ‐Fe nucleation, and then resulting in different variation of dislocation density. It is found that a periodical fluctuation of flow stress appears as the alternative occurrence of first rise and then drop followed by drop and rise, and the phenomenon is inferred to be caused by local dynamic recrystallization in the dendrites and the neighboring interdendritic spacings.
Effects of the Ethanolic Extract of Onion Peel on the Physicochemical Properties of Wheat Starch
Authors: Wang Cuntang , Wang Yuqing , Tian Shengxin , Du Guojun
Published: March 2024

The objective of this study is to examine the interactions between wheat starch (WS) and ethanol extract of onion peel (EEOP) at varying concentrations (1.0%, 2.5%, 5.0%, and 10.0%) during the process of gelatinization, and to assess the impact of these interactions on the physicochemical and retrogradation characteristics of wheat starch. In contrast to the control group, the incorporation of EEOP results in a reduction in retrogradation, an increase in solubility, and an increase in the swelling degree of wheat starch. Furthermore, the addition of the EEOP effectively hinders the retrogradation process of wheat starch. The incorporation of EEOP has the potential to decrease the enthalpy associated with starch retrogradation. Accordingly, the addition of 10% EEOP results in a decrease of 43.6% in the enthalpy of starch retrogradation in wheat starch after a storage period of 15 days, as compared to the control group. In addition, the incorporation of an enzyme known as EEOP has the potential to reduce the occurrence of crystallization in the process of starch retrogradation. Hence, the incorporation of EEOP may impede the regression of WS.
Mechanical performance of crumbed rubber concrete subjected to high temperature
Authors: Duan Daoming , Li Fumin , Guo Zhen , Ma Chuang
Published: March 2024

To address environmental pollution caused by waste tires, civil engineers have attempted to utilize waste tires in the construction of building structures and infrastructures, thereby conserving natural structural materials. Because of the pyrolysis of rubber at high temperature, crumbed rubber concrete (CRC) used in high‐temperature conditions or fire resistance engineering has several limitations. This study used crumbed rubber (CR) particles to replace fine aggregate in equal volume and fulfilled steady‐state tests at high temperatures to investigate the failure modes and mechanical behavior of CRC subjected to high temperatures. The effects of rubber content (0%, 10%, and 20%) and particle size (0.106, 0.425, and 2 mm) on the elastic models, ultimate compressive strengths, and peak strain of CRC mechanical properties were investigated using scanning electron microscopy analysis. The test results showed that at the same temperature, the mechanical properties reduced as the CR content increased. When suitable particle sizes of CR were employed, the reduction in the mechanical properties was slower compared to when CRC utilized smaller or larger particle sizes of CR. Because of the filling pores in CRC after CR decomposition at high temperatures, the compressive strength and elastic modulus of CRC fluctuated significantly.
Mission‐based design of UAVs
Authors: Chaudemar Jean‐Charles , Aïello Ombeline , de Saqui‐Sannes Pierre , Poitou Olivier
Published: March 2024

Over the past decades, Unmanned Aerial Vehicles (UAVs) have increasingly been used in a wide variety of missions that range from surveillance to delivery. Unlike aircraft that always carry goods and passengers from an airport to another, UAVs do not systematically implement the same type of mission. UAVs are indeed multi‐mission during their time in operation, and the systems engineering approaches developed for one mission aircraft must be adapted to the multi‐mission context. Therefore, UAV design requires application of mission engineering upstream systems engineering, either to assess there is a UAV system that may accomplish a new mission, or to specify a new UAV system according to a given mission. To achieve that goal, the authors of the paper support the use of Model‐Based Mission Engineering. A three‐layer architecture ‐ purpose, operation, functions or capabilities ‐ is proposed as a design framework for missions. The Goal‐Oriented Requirements Language (GRL) serves as mission description language. The paper extends GRL to better address mission‐based design of UAVs. It is proposed to distinguish between internal and external resources. A goal detailing mechanism is introduced. A degraded mode evaluation becomes possible. GRL tools make it possible to evaluate how much a UAV system ‐ at least, an operator, a ground station, and a UAV ‐ may satisfy every stakeholder in both nominal and degraded modes. The proposed approach is applied to a high voltage surveillance UAV. The case study enables the introduction of four actors—Authority, Client, UAV and MissionSupervisor—that turn out to be generic and can be reused for other missions and UAV designs.
Soils information for urban customers: A perspective
Authors: Ohm Hannah M. , DeSutter Thomas M. , Hargiss Christina L. , Anderson Keith A. , Derby Nathan E. , Alvarez‐Torres Beverly
Published: March 2024

Due to its benefits, including but not limited to increased access to affordable healthy food, bringing communities together for a common goal, and improving food security, urban agriculture is gaining popularity across the United States. Although soil‐based information is available at the national level, people in urban environments may have limited details about the soils in their communities. To bridge the gap between rural and urban agriculture, city, state, and federal agencies such as the Natural Resources Conservation Service could expand upon the soil survey programs that currently exist and are available within the WebSoilSurvey. Additionally, trace element testing and interpretation would allow for improved knowledge about the risks that urban soils may have on food quality for those interested in urban agriculture.

Core Ideas

Detailed soil science information for urban agriculture may be lacking on a fine scale.

Opportunities exist to support the soil science needs of urban growers via local, state, and federal entities.

Information on urban soils can help provide healthy and sustainable foodstuffs.
Removal of reactive red dye by reusable chitosan‐polyaniline/Fe3O4 nanocomposite
Authors: An Tran Nguyen Minh , Phuc Tran Thanh , Nhi Dang Nguyen Thien , Van Cuong Nguyen
Published: March 2024

We report herein the synthesis of chitosan‐polyaniline/Fe3O4 (CS‐PANI/Fe3O4) nanocomposite for decoloring of Reactive Red 198 (RR 198) in aqueous solution. The prepared CS‐PANI/Fe3O4 was characterized by using Fourier transform infrared spectroscopy (FT‐IR), field‐emission scanning electron microscopy (FE‐SEM), and X‐ray diffraction (XRD). Various factors affected the removal of RR 198 such as removal time, dye concentration, pH, and adsorbent dose were also investigated. The maximum removal yield was found to be 96.16 % when adsorbed condition was 0.1 g of CS‐PANI/Fe3O4 in 50 mL of 50 ppm RR 198 dye solution, pH of 7 and adsorbed time of 120 min. The results indicated that the removal percentage of RR 198 dye was increased and up to 96.16 % when the adsorbed times increased.
Chemical constituents of the n‐hexane extract of Leonotis nepetifolia (L.) R. Br (Lamiaceae)
Authors: Tung Phan Thanh , Quyen Tran Hong Ngoc , Quang Ton That , Van Nguyen Thien Truong , Duong Ngo Thi Thuy , Ngan Vu Thi Tuyet , Nga Lai Thi , Phung Nguyen Kim Phi , Thu Nguyen Thi Hoai
Published: March 2024

Friedelin (1), 5α‐stigmast‐22‐ene‐3‐one (2), chrysophanol (3), physcion (4), 4'‐O‐methylalpinumisoflavone (5), and tetracosanoic acid (6) were isolated from the n‐hexane extract of Leonotias nepetifolia (L.) R. Br collected at Ba Ria ‐ Vung Tau province, Vietnam. The chemical structures of these compounds were elucidated by MS and NMR spectroscopic analysis as well as compared with data in the literature. These compounds were known in Leonotis nepetifolia for the first time. Further studies on this plant are in progress.
Isoflavones from Placolobium vietnamense, an indigenous plant of Vietnam
Authors: Lien Do Thi My , Tuyet Huynh Thi Ngoc , Quyen Tran Hong Ngoc , Truong Tuong Lam , Hang Nguyen Thi Thu , Thao Nguyen Thi Ngoc , Dung Nguyen Thi My
Published: March 2024

Placolobium vietnamense N.D.Khoi & Yakovlev (Fabaceae) is an indigenous plant of Vietnam. Up to now, this plant has not yet been chemically and biologically studied. In this paper, six isoflavones including afrormosin (1), cladrastin (2), 8‐O‐methylretusin (3), millesianin C (4), barbigerone (5), and durallone (6) were isolated from the ethyl acetate extract of the stem bark of Placolobium vietnamense. Their structures were established by means of physical data (ESI MS, 1D and 2D NMR) and evaluated for the cytotoxic activities against liver hepatocellular carcinoma (HepG2), human lung cancer (NCI‐H460), human epithelial carcinoma (HeLa) and human breast cancer (MCF‐7) cell lines. This is the first report on phytochemical studies of this plant.
Study of ozone disinfection in the hospital environment
Authors: Tu Le Hoang , Oanh Le Hoang , Trung Nguyen Vu , Cuong Le Cao , Oanh Doan Thi Yen , Dieu Tran Vinh , Nghi Nguyen Hoang
Published: March 2024

Hundreds of millions of patients are affected by health care‐associated infections worldwide each year. In the hospitals, contaminated surfaces and air may play an important role in the transmission of respiratory pathogens. Recently, ozone disinfection is employed and shows the effectiveness as an alternative sanitizing technology to conventional disinfectants in reducing the microbial contamination in air as well as in the surfaces of the functional rooms of the hospitals. In this paper, the disinfection capacity of ozone gas is investigated by means of analysing the CFU reduction during ozonation of an operative theatre in Ha Dong polyclinic hospital (Hanoi, Vietnam). The full removal of the microorganisms and fungi in the operative theatre during ozonation was achieved by using ozone of 5 ppm concentration and exposure time of 40‐60 min.
New iridoid from Valeriana hardwickii Wall.
Authors: Hong Le Thi Thu , Huyen Tran Thi , Tri Le Minh , Hien Tran Duy , Loi Huynh
Published: March 2024

A new iridoid, (4S,5R,6S,7S,9S)‐7,10,11‐trihydroxy dihydronepetalactone (1) together with four known flavonoids including linarin, neodiosmin, neobudofficide and rhoifolin were isolated from aerial parts of Valeriana hardwickii Wall.. Chemical structures were elucidated by extensive spectroscopic analyses including ESI‐HRMS and 1D, 2D‐NMR spectral data as well as by comparison with those reported in the literatures. Compound 1 showed no cytotoxic activity toward three human cancer cell lines (CCRF‐CEM, MDA‐MB‐231 and HCT‐116).
Safe sodium‐ion battery using hybrid electrolytes of organic solvent/pyrrolidinium ionic liquid
Authors: Quan Phung , Linh Le Thi My , Tuyen Huynh Thi Kim , Van Hoang Nguyen , Thanh Vo Duy , Van Man Tran , Phung Le My Loan
Published: March 2024

Ionic liquids (ILs) have been considered as an alternative class of electrolytes compared to conventional carbonate solvents in rechargeable lithium/sodium batteries. However, the drawbacks of ILs are their reducing ionic conductivity and their large viscosity. Therefore, mixtures of alkyl carbonate solvents with an IL and a sodium bis(trifluoromethane sulfonyl)imide (NaTFSI) have been investigated to develop new electrolytes for sodium‐ion batteries. In this work, N‐Butyl‐N‐methylpyrrolidinium bis(trifluoro‐methanesulfonyl) imide (Py14TFSI) was used as co‐solvent mixing with commercial electrolytes based on the carbonate, i.e. EC‐PC (1:1), EC‐DMC (1:1), and EC‐PC‐DMC (3:1:1). The addition of ionic liquid in the carbonate‐based electrolyte solution results in (i) enhancing ionic conductivity to be comparable with a solvent‐free IL‐based electrolyte, (ii) maintaining the electrochemical stability window, and (iii) IL acted as a retardant rather than a flame‐inhibitor based on the self‐extinguish time (SET) of the mixed electrolyte mixture when exposed to a free flame. All mixed electrolyte systems have been tested in sodium‐coin cells versus Na0.44MnO2 (NMO) and hard carbon (HC) electrodes. The cells show good performances in charge/discharge cycling with a retention > 96 % after 30 cycles (∼90 mAh.g‐1 for NMO and 180 mAh.g‐1 for HC, respectively) demonstrating good interfacial stability and highly stable discharge capacities.
Synthesis of graphene oxide ‐ based silver cotton fabric application for antibacterial activity
Authors: Diep Tran Chau , Dat Nguyen Minh , Tai Le Tan , Phuc Nguyen Ha Thien , An Nguyen Thi Thuy , Huong Le Tran Thien , Hung Nguyen Gia , Hy Lac Dan , Oanh Doan Thi Yen , Nam Hoang Minh , Phong Mai Thanh , Hieu Nguyen Huu
Published: March 2024

In this study, silver/graphene oxide nanocomposites (Ag/GO) was synthesized via in situ method for antibacterial application. Silver/graphene oxide cotton fabric(Ag/GO/cotton fabric) was then synthesized via the dip ‐ coating method. The characteristics of GO, Ag/GO, and Ag/GO/cotton fabric were investigated with Fourier transform infrared spectroscopy, X‐ray diffraction, transmission electron microscopy, Raman spectroscopy, and energy ‐ dispersive X‐ray spectroscopy. The results showed that the distribution of silver particles with an average size of 17.41±4.55 nm was uniformed on the GO sheets. The Ag/GO mounted on the fabric surface after coated. Pseudomonas aeruginosa ATCC 27853 (P. aeruginosa) and Staphylococcus aureus ATCC 25923 (S. aureus) were used to test the antibacterial activity of Ag/GO and Ag/GO/cotton fabric by disk diffusion method. The results demonstrated that Ag/GO displayed high antibacterial activity with minimum inhibitor concentration (MIC) value was 2.0 and 50.0 μg/mL with P. aeruginosa and S. aureus, respectively. The Ag/GO/cotton fabric was able to against two types of bacteria P. aeruginosa and S. aureus with diameter of inhibition zone was 5.00 and 2.50 mm, respectively. The results had prospective applications in a lot of fields like clothing, mask, and protective gear.
Flavonoids and phenolics from the wholeplant of Macrosolen bidoupensis Tangane & V.S. Dang
Authors: Hung Le Kieu , Thanh Phan Duy , Minh Phan Nhat , Dat Bui Trong , Tuyen Pham Nguyen Kim , Chi Huynh Bui Linh , Dan Nguyen Thi Ngoc , Van Son Dang , Tri Mai Dinh , Phat Nguyen Tan
Published: March 2024

Five flavonoids, including quercetin (1) and four its derivatives, quercitrin (2), isoquercitrin (3), astibin (4), and rutin (5), together with two phenolic glycosides, 3,3′‐di‐O‐methylellagic acid 4‐O‐β‐D‐xylopyranoside (6), and aesculin (7) were isolated from the whole plants of Macrosolen bidoupensis Tangane & V.S. Dang. Their chemical structures were characterized using HR‐ESI‐MS, NMR data and comparison with published data. Compounds (3, 4 & 7) were notified from the Macrosolen genus for the first time, whereas, all isolated compounds were informed for the first time from this species.
In silico studies of natural products from medicinal plants to identify potential inhibitors for SARS‐CoV‐2 3C‐like protease
Authors: Khanh Nguyen Tan , Hoa Tran Thanh
Published: March 2024

The coronavirus outbreak of 2019 (COVID‐19) has been seen as a global health concern. The 3‐chymotrpsin‐like protease or SARS‐CoV‐2 main protease, whose ability to control the coronavirus replication, has been a promising target for developing drugs against coronavirus infection. In this study, we used the molecular docking approach to screen natural compounds from traditional medicinal plants in Vietnam to find the possible inhibitors of SARS‐CoV‐2 main protease. The docking results revealed that among 170 compounds, the top 15 compounds with the high binding affinity to 3CL protease (PDB ID: 6WNP) might act as promising anti‐SARS‐CoV‐2 molecules. Among these compounds, Gracillin and Proanthocyanidins showed the highest binding affinity with a docking score of ‐9.2 Kcal/mol. However, further experiments are required for developing possible natural therapeutic medications for combating this coronavirus.
Ultrahigh sun‐light‐responsive/not responsive integrated catalyst for C‐S arylation/humidity sensing
Authors: Chaubey Surabhi , Yadav Rajesh K. , Kim Tae Wu , Singh Atul P. , Kumar Kuldeep , Yadav B. C.
Published: March 2024

Covalent organic frameworks (COFs) exhibit excellent characteristics in the optoelectronic and photocatalytic areas. The broad demand for highly efficient flexible clothes enhances the investigation of multifarious COFs materials. Currently, COFs have materialized as future generation flexible clothes layered materials with previously designed π‐π stacking skeletons and extremely efficient ordered structures, which are more fascinated for countering their photocatalytic characteristics. Still, COFs are generally formed as solid materials because of direction‐dependent growth which make them unpredictable to integrate into flexible clothes. Here, by choosing tetraamino‐benzoquinone (T) and N,N'‐di‐(4‐benzoic acid)‐perylene‐3,4,9,10‐tetracarboxylic acid diimide (BP) monomers with photocatalytic activity, ornately designed sun‐light‐responsive COFs with well‐ordered donor and acceptor moieties are in situ synthesized on flexible activated carbon cloth (fACC), eventually forming TBPCOF‐fACC structures. Ultra‐responsive photocatalyst is fruitfully fabricated with the TBPCOF‐fACC structure and showed an excellent selective C‐S arylation performance with high yields (99 %) at ambient temperature. The research presents new plans for constructions of advanced light harvesting functional flexible clothes with programmable COFs material, covering the technique for a creation of highly improved applications in photocatalytic and various areas. The TBPCOF‐fACC based humidity sensor shows the average sensitivity as 1.58 MΩ/%RH along with calculated response and recovery time as 15 s and 55 s respectively. The sensor has 96.20 % repeatability and shows long term stability.
Binary TiO2/reduced graphene oxide nanocomposite for improving methylene blue photodegradation
Authors: Trinh Dinh Ngoc , Viet Thieu Quang Quoc , Nhu Tran Huynh , Dat Nguyen Minh , Thinh Doan Ba , Hai Nguyen Duy , Tai Le Tan , Oanh Doan Thi Yen , Khoi Vu Hoang , Nam Hoang Minh , Phong Mai Thanh , Hieu Nguyen Huu
Published: March 2024

Herein, TiO2/reduced graphene oxide (TiO2/rGO) nanocomposites were fabricated using the hydrothermal method and investigated with the amount of titanium precursors. The binary nanocomposites were characterized by modern analysis method. The adsorption capacity and photocatalyst degradation were performed based on methylene blue. The appropriate as‐prepared material with 1.5 mL TIP contained a large specific surface area (110.549 m2/g) with TiO2 ranging 4‐25 nm homogenously grafting on the rGO surface. The adsorption results were shown in good accordance with the pseudo‐second‐order while the photoreaction kinetics pursued the pseudo‐first‐order with a high‐rate constant. After the adsorption state, the yield reaches 62.1 % and under UV light for 90 min, 96.8 % of MB was efficiently degraded from water media, which showed a more impressive effect as compared with P25 and rGO. Therefore, the use of TiO2/rGO could be applied in the mass‐scale treatment of organic pollutants in wastewater.
Evaluation of SARS‐CoV‐2 inhibition of some compounds inCYMBOPOGON CITRATUS oil combining docking and molecular dynamics simulations
Authors: Thuy Bui Thi Phuong , Nhan Vo Duy , Quang Nguyen Minh , Duoc Nguyen Thanh , Van Tat Pham
Published: March 2024

The visual screening and simulation methods were used to evaluate the inhibitory ability of 34 compounds in Cymbopogon citratus oil against SARS‐CoV‐2. We chose the best compound, SC22, with a DS of ‐12.80 Kcal. mol‐1 with a distance RMSD of 0.23. This was the most effective compound at inhibiting the viral protein 6LU7. For the protein ACE2 or an endemic host receptor, the docking ability of SC22 showed DS = ‐13.13 Kcal.mol‐1 and RMSD = 1.32 Å; SC10 docked in DS = ‐12.79 Kcal.mol‐1 and RMSD = 0.91 Å; SC11 gave the docking values DS = ‐12.77 Kcal.mol‐1 and RMSD = 1.15 Å. SC26 showed DS = ‐12.76 Kcal.mol‐1 and RMSD = 1.44 Å; SC20 showed DS = ‐12.68 Kcal.mol‐1 and RMSD = 1.22 Å; the Cymbopogon citratus oil involved the potential compounds for contributing to drug development. The compounds SC10, SC11, SC20, SC22 also tested and refined the druglikeness properties. The compound SC22 gives many druglikeness properties and is easy to carry out drug synthesis.
Secondary metabolites from the tubers of Dioscorea persimilis
Authors: Ngan Nguyen Thi Thanh , Hoang Nguyen Huy , Hien Nguyen Thu , Lan Nguyen Ngoc , Huong Pham Thi Mai , Quang Tran Hong
Published: March 2024

Seven secondary metabolites were isolated from the aqueous fraction of Dioscorea persimilis tubers using combined chromatographic techniques. Their structures were identified as 4‐O‐(6′‐O‐glucosyl‐4′′‐hydroxybenzoyl)‐4‐hydroxybenzyl alcohol (1), trans‐N‐p‐coumaroyltyramine (2), cyclo‐(Phe‐Tyr) (3), syringaresinol (4), syringaresinol O‐β‐D‐glucopyranoside (5), corchoionoside C (6), and oct‐1‐en‐3‐yl arabinopyranosyl‐(1→6)‐β‐glucopyranoside (7) by 1D and 2D NMR and MS methods in comparison with the data reported in the literature. In addition, weak cytotoxicity on HepG2, MCF7, and SK‐Mel‐2 cancer cell lines were observed for compounds 1‐3. Notably, this is the first time to report the isolation, structural elucidation, and cytotoxicity of compound 1.
Facile synthesis and characterization of CuCl@MIL‐101(Cr)‐NH2 framework for carbon monoxide adsorption
Authors: Ky Vo The , Van Cuong Nguyen , Hoa Vu Thi , Quang Duong Tuan
Published: March 2024

The development of a highly efficient CO‐selective adsorbent with high CO adsorption and selectivity is a challenging task. In this work, a novel adsorbent CuCl@MIL‐101(Cr)‐NH2 [Cu(I)@MIL‐101(Cr)‐NH2] with varied Cu(I) loads was fabricated for CO adsorption. An equimolar mixture of CuCl2 and Cu(HCOO)2 was first impregnated into MIL‐101(Cr)‐NH2 host, followed by reduction at a low temperature of 150 oC. The obtained material was characterized by XRD, FT‐IR, XPS, FE‐SEM, TGA, and N2 sorption methods. CO adsorption experiments revealed that the Cu(I)@MIL‐101(Cr)‐NH2 showed considerably improved CO‐adsorbing capacity owing to the formation of π‐complex between Cu+ and CO. At 25 oC and 100 kPa, the prepared adsorbent contained 30 wt% of CuCl exhibited a maximum CO uptake capacity of ~2.40 mmol.g‐1, exceeding many other Cu(I)‐containing adsorbents that used conventional host materials, such as CuCl/γ‐Al2O3, CuCl/MCM‐41, CuZSM‐5, Cu(I)‐loaded porous organic polymer, CuCl/AlOOH, and CuCl@γ‐Al2O3. Furthermore, Cu(I)@MIL‐101(Cr)‐NH2 exhibited a higher isosteric heat of CO adsorption than MIL101(Cr)‐NH2. The findings suggest that incorporating Cu(I) into metal‐organic frameworks could be a promising strategy for developing CO‐selective materials.
Investigation of structural and conductivity properties of poly(vinyl alcohol)‐based electrospun composite polymer blend electrolyte membranes for battery applications
Authors: Gul Rahmat , Mahmood Wan Ahmad Kamil
Published: March 2024

Solid polymer electrolyte has attracted great interest for the next generation of electrochemical devices such as batteries, but the low ionic conductivity and poor stability has retarded their commercial acceptance for energy storage devices applications. To overcome these issues, strategies to develop composite polymer electrolytes (CPEs) are drawing interest. Nanocomposite solid polymer blend electrolyte membranes based on poly (vinyl alcohol) (PVA), poly (vinyl pyrrolidone) (PVP) of various compositions that contained potassium nitrate (KNO3) as a dopant salt, and Barium Titanate (BaTiO3) as a filler were prepared with various concentrations of filler using electrospinning technique. The structural and complex formations due to interaction of various groups of the prepared composite polymer electrolyte membranes were investigated using X‐ray diffraction (XRD) and Fourier transform infra‐red (FTIR) spectral analysis. The conductivity of the PVA‐PVP‐KNO3‐BaTiO3 polymer electrolyte systems was found to vary between 3.71×10‐9 and 1.99×10‐5 S cm‐1 at 298 K with the increase in filler concentration. The maximum room temperature ionic conductivity (1.99×10‐5 S cm‐1) has been obtained for 9 wt% BaTiO3 doped polymer electrolyte system. The addition of filler also enhanced the thermal stability of the electrolyte. The temperature dependence ionic conductivity of the prepared complexed polymer electrolyte systems appears to obey Arrhenius behaviour.
Structural aspects, reactivity analysis, wavefunction based properties, cluster formation with helicene and subsequent detection from surface enhancement in Raman spectra of triclabendazole studies using first principle simulations
Authors: Pooventhiran T. , Thomas Renjith , Bhattacharyya Utsab , Sowrirajan S. , Irfan Ahmad , Rao D. Jagadeeswara
Published: March 2024

This manuscript aims to study the structure and the other physical and chemical properties of triclabendazole, which is used to treat liver flukes, with the help of electronic structure methods. With the help of density functional theory, the ground state geometry of the triclabendazole molecule was optimized using B3LYP functional along with aug‐cc‐pVDZ basis set. The reactivity descriptors were discussed in detail to evaluate the biological potential of the compound. The molecule was found to show excellent nonlinear optical properties when compared to standard molecules like urea and p‐nitroacetanilide. Wavefunction dependent properties like ALIE, LOL, LIE etc. studies provided a lot of information regarding the electronic properties that are ample for predicting the bioactivity of the same molecule. The molecule gets adsorbed over the surface of the helicene nanocluster with slightly negative adsorption energy and shows an effective SERS mechanism.
Phenolics and triterpenoids from the bark of Sterculia foetida Linn.
Authors: Tuyen Pham Nguyen Kim , Trang Nguyen Thi Quynh , Hoa Nguyen Thi , Doan Huynh Cong , Chi Huynh Bui Linh , Huy Tran The Anh , Trang Nguyen Thi Thu , Tien Dang Thi Cam , Thu Nguyen Thi Hoai
Published: March 2024

Sterculia foetida belongings to Sterculiaceae family possessed many bioactivities for treatment of rheumatism, emphysema, laxative, diuretic, asthma, arthritis, antipyretic, antibacterial, antifungal and antibiotic, etc. However, the bark of this species was the understudied part. Herein, eight compounds consisting of cleomiscosin A (1), cleomiscosin C (2), quercetin (3), kaempferol 3‐O‐β‐D‐xylopyranoside (4), lupeol (5), lupenone (6), betulinic acid (7), and taraxerol (8) were reported from the Sterculia foetida bark collected at Binh Thuan province, Viet Nam. Their chemical structures were elucidated by the MS and NMR spectroscopic analysis as well as the comparison of their NMR data with the reported data. Compounds 1 and 2 were notified for the first time from Sterculia genus.
Facile fabrication of LaFeO3/zeolite composite for degradation of tetracycline with enhanced photo‐Fenton catalytic activity under visible light
Authors: Nga Phan Thi To , Nhan Phan Chi , Huyen Tran Thi Thanh ,   Phan Thi To Nhu
Published: March 2024

LaFeO3/zeolite (LFO‐Z) composite has been successfully synthesized via impregnation‐calcination method for the photo‐Fenton degradation of Tetracycline (TC). The incorporation of LaFeO3 particles on zeolite support contributes to the enhancement in photo‐Fenton catalytic activity of LFO‐Z photocatalyst by increasing the contact area between the material and TC molecules. The LFO‐Z photocatalyst was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X‐ray diffraction (XRD), N2 adsorption‐desorption, and optical absorption spectra. Different operational parameters such as catalyst dosage, H2O2 concentration, pH was investigated in the photo‐Fenton catalytic degradation of TC. 76.4 % of TC was degraded after 150 min exposure to visible light under the conditions of 1 g L‐1 LFO‐Z, 10 mg L‐1 TC, 10 mM H2O2 and pH of 6. The LFO‐Z composite shows a high stability and reusability, suggesting its potential use as a photocatalyst for pharmaceutical degradation via the photo‐Fenton process.
Furofuran lignans from Valeriana jatamansi with their antioxidant and anticancer properties
Authors: Huong Tran Thu , Tram Le Huyen , Van Thong Nguyen , Minh Nguyen Hoang , Minh Tran Thi , Quang Tran Thuong , Ha Tran Thu , Hung Nguyen Duc , Van Don Dao , Nguyen Thi Minh Nguyet , Park Jong‐Tae
Published: March 2024

Valeriana jatamansi is hired as multiple remedies for treatment of insomnia and circulatory disorders, asthma, dry cough, jaundice, and skin diseases. A phytochemical investigation from the whole plant of V. jatamansi resulted in isolation and identification of five furofuran lignans including 8‐hydroxypinoresinol‐4‐O‐β‐D‐glucoside (1), 8‐hydroxypinoresinol‐4'‐O‐β‐D‐glucoside (2), prinsepiol‐4‐O‐β‐D‐glucopyranoside (3), (+)‐pinoresinol‐O‐β‐D‐glucopyranoside (4), and (+)‐syringaresinol (5) for the first time. Their structures were elucidated by analysis and comparison of their spectroscopic data with those reported in the literature. Furthermore, the biological properties of these isolates were evaluated in vitro for anti‐oxidant and anticancer activities.
Current situation and health risk assessment of acetaminophen and chlorpheniramine maleate in urban house dust from Hanoi, Vietnam
Authors: Hoang Ho Nguyen , Hanh Duong Thi , Ha Le Song , Duong Nguyen Thanh , Ha Trinh Thu
Published: March 2024

Acetaminophen and chlorpheniramine maleate are widely used as pain medications, they still have negative impacts on the environment as well as affect human health adversely. However, there are few studies evaluating levels of these medicals in airborne environments especially house dust. Therefore, this study aimed to investigate distribution, concentration and assess risk to human health of acetaminophen and chlorpheniramine maleate in house dust samples collected from 6 inner districts of Hanoi. Acetaminophen was found in 80 % house dust samples with an average concentration of 0.295 μg/g (ranging from 0.038 to 1.480 μg/g). Meanwhile, the average concentration of chlorpheniramine maleate was revealed much lower at 0.024 μg/g (ranging from 0.013 to 0.051 μg/g, the detection frequency of 80 %). Based on the measured concentrations, the acute daily intake doses of acetaminophen and chlorpheniramine maleate for adults and children were calculated to be 1.57 × 10‐1; 2.82 and 1.29 × 10‐2; 2.32 × 10‐1, respectively, the estimated values of Hazard Quotient (HQ) were 6.3 × 10‐7; 1.13 × 10‐5 and 4.04 × 10‐8; 7.24 × 10‐7, respectively. All HQ values of the pain relievers were < 1 for both adults and children, indicating the potential adverse effects to humans are negligible.
Review: Bioactive metabolites and host‐specific toxins from endophytic Fungi, Alternaria alternate
Authors: Hashad Nashwa , Ibrahim Reham , Mady Mohamed , Abdel‐Aziz Mohamed S. , Moharram Fatma A.
Published: March 2024

Genus Alternaria is widely distributed fungus isolated from many plants among which Alternaria alternate that has a wide range of metabolites which possess a great variety of biological activities as being anticancer, antioxidants, antimicrobial. This review will highlight the structurally different secondary metabolites reported from A. alternate species including its host specific metabolites, their function, and their bioactivity.