检索结果-南通市图书馆

Fabrication of zinc-based coordination polymer nano-cubes and post-modification through copper decoration

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2018年第11期11卷 5890-5901页

作者： ngoc Minh Tran Hien Duy mai Hyojong Yoo Department of Chemistry Hallym University Chuncheon Gangwon-do 24252 Republic of Korea

Coordination polymer particles (CPPs) with a high degree of porosity and multi-functional reaction sites are promising for diverse applications. The integration of open sites favorable for the post-modification of CPPs presents a unique opportunity for the rational design of inorganic materials with target-oriented functions. Herein, we report a shape-controllable synthetic protocol for zinc-based coordination polymer nanocubes (Zn-CPNs). In the synthesis, 2,6-bis[(4-carboxyanilino)carbonyl] pyridine ([N3]) ligand is employed as an efficient shape-directing modulator to control the size and shape of Zn-CPNs. More importantly, the [N3] ligand provides metal binding sites suitable for the decoration of other functional metals such as copper ions. The copper-modified Zn-CPNs (Cu_Zn-CPNs) show good activities in a heterogeneous catalytic reaction.

关键词： zinc-based coordination polymer nanocubes shape-directing modulator size and shape controls post-modification heterogeneous catalytic reaction

A new generic open pit mine planning process with risk assessment ability

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Coal Science & Technology 2016年第4期3卷 407-417页

作者： ngoc Luan mai Oktay Erten Erkan Topal Westem Australian School of Mines Curtin University of Technology Bentley WA 6102 Australia Nazarbayev University Astana Kazakhstan

Conventionally, mining industry relies on a deterministic view, where a unique mine plan is determined based on a single resource model. A major shortfall of this approach is the inability to assess the risk caused by the well-known geological uncertainty, i.e. the in situ grade and tonnage variability of the mineral deposit. Despite some recent attempts in developing stochastic mine planning models which have demonstrated promising results, the industry still remains sceptical about this innovative idea. With respect to unbiased linear estimation, kriging is the most popular and reliable deterministic interpolation technique for resource estimation and it appears to remain its popularity in the near future. This paper presents a new systematic framework to quantify the risk of kriging-based mining projects due to the geological uncertainties. Firstly, conditional simulation is implemented to generate a series of equally-probable orebody realisations and these realisations are then compared with the kriged resource model to analyse its geological uncertainty. Secondly, a production schedule over the life of mine is determined based on the kriged resource model. Finally, risk profiles of that production schedule, namely ore and waste tonnage production, blending grade and Net Present Value （NPV）, are constructed using the orebody realisations. The proposed model was applied on a multi-element deposit and the result demonstrates that that the kriging-based mine plan is unlikely to meet the production targets. Especially, the kriging-based mine plan overestimated the expected NPV at a magnitude of 6.70% to 7.34% （135 M$ to 151 M$）. A new multivariate conditional simulation framework was also introduced in this paper to cope with the multivariate nature of the deposit. Although an iron ore deposit is used to prove the concepts, the method can easily be adapted to other kinds of mineral deposits, including surface coal mine.

关键词： Open pit mine planning Geological uncertainty Multivariate conditional simulation Grade/tonnage curves

The Trade-Off Between Performance and Security of Virtualized Trusted Execution Environment on Android

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computer Systems Science & Engineering 2023年第9期46卷 3059-3073页

作者： Thien-Phuc Doan ngoc-Tu chau Jungsoo Park Souhwan Jung Soongsil University Seoul06978Korea

Nowadays,with the significant growth of the mobile market,security issues on the Android Operation System have also become an urgent *** execution environment(TEE)technologies are considered an option for satisfying the inviolable property by taking advantage of hardware ***,for Android,TEE technologies still contain restrictions and *** first issue is that non-original equipment manufacturer developers have limited access to the functionality of hardware-based *** issue of hardware-based TEE is the cross-platform *** every mobile device supports different TEE vendors,it becomes an obstacle for developers to migrate their trusted applications to other Android devices.A software-based TEE solution is a potential approach that allows developers to customize,package and deliver the product *** by that idea,this paper introduces a VTEE model,a software-based TEE solution,on Android *** research contributes to the analysis of the feasibility of using a virtualized TEE on Android devices by considering two metrics:computing performance and *** experiment shows that the VTEE model can host other software-based TEE services and deliver various cryptography TEE functions on theAndroid *** security evaluation shows that adding the VTEE model to the existing Android does not addmore security issues to the traditional ***,this paper shows applicable solutions to adjust the balance between computing performance and security.

关键词： Mobile security trusted execution model virtualized trusted execution environment hypervisor

A kinetic model for a single step biodiesel production from a high free fatty acid (FFA) biodiesel feedstock over a solid heteropolyacid catalyst

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Green Energy & Environment 2019年第3期4卷 328-341页

作者： Aashish Gaurav Stéphane Dumas chau T.Q.mai Flora T.T.Ng Department of Chemical Engineering University of Waterloo

Production of biodiesel from yellow grease(waste cooking oil and waste animal fats) is fast emerging as a promising alternative to address the twin challenges before the biodiesel industry today-fluctuation in prices of vegetable oil and the food versus fuel debate. Yellow grease has a high percentage of free fatty acids(FFA) and proves to be an unsuitable feedstock for biodiesel production from commercially viable alkalicatalyzed production systems due to saponification problems.'Green' methodologies based on heterogeneous solid acid catalyzed reactions have the potential to simultaneously promote esterification and transesterification reactions of yellow grease to produce biodiesel without soap formation and offer easy catalyst separation without generation of toxic streams. This paper presents kinetic studies for the conversion of model yellow grease feeds to biodiesel using a heteropolyacid supported on alumina(HSiW/Al2O3) using a batch autoclave. Three model yellow grease feeds were prepared using canola oil with added FFA such as palmitic, oleic and linoleic acid. A pseudo homogeneous kinetic model for the parallel esterification and transesterification was developed. The rate constants and activation parameters for esterification and transesterification reactions for the model yellow grease feeds were determined. The rate constants for esterification are higher than the transesterification rate constants. The kinetic model was validated using the experimental biodiesel data obtained from processing a commercial yellow grease feed. The kinetic model could be used to design novel processes to convert various low-value waste oils, fats and non-food grade oils to sustainable biodiesel.

关键词： Yellow grease Canola oil Free fatty acids Heteropolyacid Kinetics for esterification and transesterification

Anaphylaxis to Cisplatin after Carboplatin Hypersensitivity Reaction in Advanced Non-Small Cell Lung Cancer

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Case Reports in Clinical Medicine 2021年第10期10卷 295-302页

作者： chau Thi ngoc Dieu Gia Hoang Nguyen Quynh Thi Hong mai Department of Pharmacy Hanoi Oncology Hospital Hanoi Vietnam Medical Oncology I Department Hanoi Oncology Hospital Hanoi Vietnam On-Demand General Medical Oncology Department Hanoi Oncology Hospital Hanoi Vietnam

Patients with non-small cell lung cancer (NSCLC) who have received more than one cycle of platinum-based chemotherapy in their lifetime may be at risk of hypersensitivity. The overall incidence of hypersensitivity to carboplatin ranges from 1% to 27% and that of hypersensitivity to carboplatin is between 5% and 20%. However, the actual incidence of cross-reactivity between platinum salts has not yet been known. In this paper, we reported a case of a 39-year-old man with advanced non-small cell lung cancer, who had cisplatin anaphylaxis after having had carboplatin hypersensitivity at the previous cycle. The anaphylactic reaction was managed successfully with adrenaline, corticosteroids, antihistamines, oxygen mask and isotonic fluid support. No further reactions were observed and after that he stopped the platinum regimen. This case illustrates that NSCLC patients may experience hypersensitive and cross-reactivity to both carboplatin and cisplatin. It is important to be aware of the possibility of anaphylaxis so that appropriate premedication or effective treatment can be promptly instituted.

关键词： Non-Small Cell Lung Cancer Anaphylaxis Cisplatin Carboplatin Hypersensitivity

Indications for and techniques of keratoplasty at Vietnam National Institute of Ophthalmology

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2016年第3期9卷 379-383页

作者： Pham ngoc Dong Truong Nhu Han Anthony J.Aldave Hoang Thi Minh chau Vietnam National Institute of Ophthalmology HanoiVietnam Stein Eye Institute the University of California Los Angeles CA 90095-7003 USA

AIM： To report the indications for and techniques of corneal transplantation at Vietnam National Institute of Ophthalmology （VNIO） over a period of 12y （2002-2013）, METHODS： Records of patients who had undergone corneal transplantation at VNIO from January 1, 2002 to January 1, 2014 were reviewed to determine the indication for and type of corneal transplant performed. Patient age, gender, indication for corneal transplantation and surgical technique were recorded and analyzed. RESULTS： Corneal transplantation were underwent in 1390 eyes of 1278 patients with a mean age of 44.9±18.1y during the period under review. The most common indication was infectious corneal ulcer （n=670; 48.2%）, followed by corneal scar （n=333, 24.0% ）, corneal dystrophy （n=138, 9.9%） and failed graft （n=112, 8.1%）. Nearly all procedures performed were penetrating keratoplasty （n=1300, 93.5% ）, with a few lamellar keratoplasty procedures performed： lamellar keratoplasty （n=52, 3.7%）, Descemet＇s stripping automated endothelial keratoplasty （n =27, 1.9% ） and deep anterior lamellar keratoplasty （n =11, 0.8%）.CONCLUSION： While the most common indication for keratoplasty was infectious keratitis, nearly all indications for corneal transplantation were managed with penetrating keratoplasty, However, lamellar keratoplasty techniques, including deep anterior lamellar keratoplasty and Descemet＇s stripping automated endothelial keratoplasty, are being performed with increasing frequency for isolated stromal and endothelial disorders, respectively,

关键词： penetratingkeratoplasty, lamellarkeratoplasty endothelial keratoplasty indication for keratoplasty technique of keratoplasty

Association between measles antibodies in vaccinated and naturally infected mothers with protective antibodies and the occurrence of measles in their children:A cross-sectional study in the Bavi district of Hanoi

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Medicine 2019年第9期12卷 404-408页

作者： Cam Nhat Nguyen Quynh ngoc Nguyen Than Huu Dao Le Thi Quynh mai Infectious Disease Prevention und Control Department Center for Disease ControlHonoiVietnom Virology Department National Institute of Hygiene and EpidemiologyHanoiVietnam

Objective:To determine the concentration and rate of decay of maternal IgG antibodies against measles prevalence in infants of vaccinated or naturally infected mothers and study initial measles immunization occurs in nine-month-old ***:In total,401 pregnant women and the same number of their subsequent newborns were recruited in the Bavi district of Hanoi in 2016-2017;they were divided into two groups:Older women(born before 1985,n=201)and younger women(born after 1990,n=200).Samples were collected at five time-points;week 36 of pregnancy,birth(cord),and 3,6,and 9 months after ***-specific IgG antibody levels were ***:In total,77.06% of the 401 pregnant women were seropositive for measles-specific IgG antibodies.A significantly greater proportion of mothers aged 30 and older(88.06%)and their newborn(93.53%)were seropositive compared to the mothers aged 25 and younger(66.00%),and their newborn(72.00%)(P<0.001).The infants of older mothers had significantly higher geometric mean titres(GMT)of measles IgG antibodies than the infants of younger mothers(P<0.001)at all time-points of the study *** proportion of measles IgG antibodies together with GMT decreased from 82.97%(506.96)at the age of three months to 23.19%(45.22)at the age of nine ***:This study provides a profile of maternal antibodies against measles in Vietnamese infants and investigates the early susceptibility to measles in both the infants of vaccinated mothers and mothers with naturally acquired *** data suggest that determining the appropriate age for measles vaccination is paramount for the elimination of measles in Vietnam.

关键词： Infant Measles Seropositive National Expanded Program of Immunization Vietnam

The impact of heavy metals on bacterial tolerance of antibiotic resistance and growth in the aquatic environment of Vietnam

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Infectious Diseases Research 2022年第1期3卷 1-9页

作者： Diep The Tai mai Hoang Khanh Ngan chau Kim Hung Nguyen ngoc Anh Thu Nguyen Thi ngoc Nhi Laboratory of Bacteria Pasteur Institute of Ho Chi MinhDepartment of Immunology and MicrobiologyHo Chi Minh CityViet Nam

Heavy metals may induce bacterial antibiotic resistance and affect their growth in the *** this study,we aim to determine bacterial growth and antibiotic resistance in the pressure of heavy *** the changing morphology by gram staining was checked for bacterial toleration with heavy metal,developing of the colony form unit(CFU)was analysed bacterial kinetic growths and their biofilm *** disk diffusion test was used to perform bacterial susceptibility profiles with Ceftazidime(30μg),Ceftriaxone(30μg),Colistin sulfate(10μg),Meropenem or Imipenem(10μg),Ciprofloxacin(5μg)and Azithromycin(15μg)and the CLSI was applied for interpreting the *** bacterial morphology remarkably changed from normal to short,round shape at a high concentration of heavy metals after 1 *** changing shape adapted to heavy metals by survival growing and resisted to Azithromycin,Ciprofloxacin,and Colistin without biofilm formation after 1 month,that was continued increasing after 2 *** bacterial growth and antibiotic resistance were significant differences between provinces(P=0.01),type of bacterial species,and concentration of heavy *** results indicate that heavy metals are a crucial factor-driven for enhancing bacterial adaptation in pollution water resources and inducing their antimicrobial resistance in the aquatic environment.

关键词： antimicrobial resistance heavy metals aquatic environment bacterial growth Vietnam

Language Environment Setting Through Our Foreign Currency Activities to Improve Chinese-Majoring Learners’ Competency

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Sino-US English Teaching 2019年第2期16卷 64-74页

作者： mai Thi ngoc Anh Thai Nguyen University Thai Nguyen ProvinceVietnam

Language education centers primarily on fostering linguistic skills and language communication skills for students. In the process of teaching Chinese language, it is in the classroom that is the place tofoster student’s linguistic competence and language communication capacity. Therefore, classroom teaching becomes the main place tofoster the language ability and language communication capacity for students while the extracurricular activities are the place for students to apply the knowledge they have learned in the classroom in to the real world. Conducting a survey to investigate extracurricular activities for Chinese language majors at Thai Nguyen University, School of Foreign Languages, the paper proposes solutions to improve the effectiveness of extracurricular activities for students and create excitement for students in learning.

关键词： setting language learning environment efficiency excitement extracurricular activities Chinese