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  • 1
    Online Resource
    Online Resource
    Erratum to: Perturbative solutions of the f(R)-theory of gravity in a central gravitational field and some applications
    Springer Science and Business Media LLC ; 2018
    In:  The European Physical Journal C Vol. 78, No. 8 ( 2018-8)
    Details
    In: The European Physical Journal C, Springer Science and Business Media LLC, Vol. 78, No. 8 ( 2018-8)
    Type of Medium: Online Resource
    ISSN: 1434-6044 , 1434-6052
    URL: Article
    DOI: 10.1140/epjc/s10052-018-6094-4
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2018
    detail.hit.zdb_id: 1397769-6
    detail.hit.zdb_id: 1459069-4
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  • 2
    Online Resource
    Online Resource
    Perturbative solutions of the f(R)-theory of gravity in a central gravitational field and some applications
    Springer Science and Business Media LLC ; 2018
    In:  The European Physical Journal C Vol. 78, No. 7 ( 2018-07)
    Details
    In: The European Physical Journal C, Springer Science and Business Media LLC, Vol. 78, No. 7 ( 2018-07)
    Abstract: Exact solutions of an f ( R ) -theory (of gravity) in a static central (gravitational) field have been studied in the literature quite well, but, to find and study exact solutions in the case of a non-static central field are not easy at all. There are, however, approximation methods of finding a solution in a central field which is not necessarily static. It is shown in this article that an approximate solution of an f ( R )-theory in a general central field, which is not necessary to be static, can be found perturbatively around a solution of the Einstein equation in the general theory of relativity. In particular, vacuum solutions are found for f ( R ) of general and some special forms. Further, applications to the investigation of a planetary motion and light’s propagation in a central field are presented. An effect of an f ( R )-gravity is also estimated for the SgrA*–S2 system. The latter gravitational system is much stronger than the Sun–Mercury system, thus the effect could be much stronger and, thus, much more measurable.
    Type of Medium: Online Resource
    ISSN: 1434-6044 , 1434-6052
    URL: Article
    DOI: 10.1140/epjc/s10052-018-6023-6
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2018
    detail.hit.zdb_id: 1397769-6
    detail.hit.zdb_id: 1459069-4
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  • 3
    Online Resource
    Online Resource
    Testing the \(f(R)\)-theory of Gravity
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2019
    In:  Communications in Physics Vol. 29, No. 1 ( 2019-02-05), p. 35-
    Details
    In: Communications in Physics, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 29, No. 1 ( 2019-02-05), p. 35-
    Abstract: A procedure of testing the \(f(R)\)-theory of gravity is discussed. The latter is an extension of the general theory of relativity (GR). In order this extended theory (in some variant) to be really confirmed as a more precise theory it must be tested. To do that we first have to solve an equation generalizing Einstein's equation in the GR. However, solving this generalized Einstein's equation is often very hard, even it is impossible in general to find an exact solution. It is why the perturbation method for solving this equation is used. In a recent work \cite{Ky:2018fer} a perturbation method was applied to the $f(R)$-theory of gravity in a central gravitational field which is a good approximation in many circumstances. There, perturbative solutions were found for a general form and some special forms of \(f(R)\). These solutions may allow us to test an \(f(R)\)-theory of gravity by calculating some quantities which can be verified later by the experiment (observation). In \cite{Ky:2018fer} an illustration was made on the case \(f(R)=R+\lambda R^2\). For this case, in the present article, the orbital precession of S2 orbiting around Sgr A* is calculated in a higher-order of approximation. The $f(R)$-theory of gravity should be also tested for other variants of $f(R)$ not considered yet in \cite{Ky:2018fer}. Here, several representative variants are considered and in each case the orbital precession is calculated for the Sun--Mercury- and the Sgr A*--S2 gravitational systems so that it can be compared with the value observed by a (future) experiment. Following the same method of \cite{Ky:2018fer} a light bending angle for an $f(R)$ model in a central gravitational field can be also calculated and it could be a useful exercise.
    Type of Medium: Online Resource
    ISSN: 0868-3166 , 0868-3166
    URL: Issue
    URL: Article
    DOI: 10.15625/0868-3166-29-1
    DOI: 10.15625/0868-3166/29/1/13192
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2019
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  • 4
    Online Resource
    Online Resource
    Scalar-tensor Theory LG = ϕR − 2γϕη and the Problem of Dark Matter
    Vietnam National University Journal of Science ; 2022
    In:  VNU Journal of Science: Mathematics - Physics Vol. 38, No. 4 ( 2022-12-17)
    Details
    In: VNU Journal of Science: Mathematics - Physics, Vietnam National University Journal of Science, Vol. 38, No. 4 ( 2022-12-17)
    Abstract: Searching for the origin of the dark matter and the dark energy is among the problems that the modern physics, including the general theory of relativity, is facing to. Various theories or models have been proposed to solve these problems without satisfactory success yet. In this work, a new model based on the scalar-tensor theory with Lagrangian LG = ϕR − 2γϕη is suggested to solve some aspects of the above-mentioned problems. In this model the dark matter is interpreted as geometric background of the space-time.
    Type of Medium: Online Resource
    ISSN: 2588-1124 , 2615-9341
    URL: Article
    DOI: 10.25073/2588-1124/vnumap.4772
    Language: Unknown
    Publisher: Vietnam National University Journal of Science
    Publication Date: 2022
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  • 5
    Online Resource
    Online Resource
    Metal-Organic Framework MIL-53(Fe) as an Adsorbent for Ibuprofen Drug Removal from Aqueous Solutions: Response Surface Modeling and Optimization
    Hindawi Limited ; 2019
    In:  Journal of Chemistry Vol. 2019 ( 2019-03-03), p. 1-11
    Details
    In: Journal of Chemistry, Hindawi Limited, Vol. 2019 ( 2019-03-03), p. 1-11
    Abstract: Ibuprofen contamination from water sources has been increasingly alarming due to its environmentally accumulative retention; however, the strategies for ibuprofen-containing water treatment are still an enormous challenge. Herein, we described the utilization of metal-organic frameworks MIL-53(Fe) (MIL = Materials of Institute Lavoisier) for the adsorption of ibuprofen in synthetic solution. Firstly, the MIL-53(Fe) was solvothemally synthesized and then characterized using the X-ray diffraction and Fourier-transform infrared spectroscopy techniques. The optimization of ibuprofen adsorption over MIL-53(Fe) was performed with three independent variables including ibuprofen concentration (1.6–18.4 mg/L), adsorbent dosage (0.16–1.84 g/L), and pH (2.6–9.4) according to the experimental design from response surface methodology. Under the optimized conditions, more than 80% of ibuprofen could be eliminated from water, indicating the promising potential of the MIL-53(Fe) material for treatment of this drug. Kinetic and isotherm models also were used to elucidate the chemisorption and monolayer behavior mechanisms of ibuprofen over MIL-53(Fe).
    Type of Medium: Online Resource
    ISSN: 2090-9063 , 2090-9071
    URL: Article
    DOI: 10.1155/2019/5602957
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2019
    detail.hit.zdb_id: 2393625-3
    detail.hit.zdb_id: 2703077-5
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  • 6
    Online Resource
    Online Resource
    KNOWLEDGE AND PRACTICE ON SAFE MOTHERHOOD OF MOTHERS GIVING BIRTH AT PUBLIC HEALTH FACILITIES OF NINH BINH PROVINCE IN 2019
    Institute of Community Health ; 2020
    In:  Tạp chí Y học cộng đồng Vol. 62, No. 1 ( 2020-11-05)
    Details
    In: Tạp chí Y học cộng đồng, Institute of Community Health, Vol. 62, No. 1 ( 2020-11-05)
    Abstract: Objective: To assess knowledge and practice on safe motherhood of mothers giving birth at public health facilities of Ninh Binh province in 2019. Subjects: Mothers giving birth at public health facilities in the province. Rearch method: Descriptive cross-sectional survey. Results: The percentage of mothers who understood correctly about safe motherhood was 38,4%; 97,5% of mothers answered that it was necessary to have health check-up before pregnancy; 86,1% of mothers reported necessity to be vaccinated before becoming pregnant; 60,2% of mothers had correct knowledge that antenatal care needs ultrasound check, blood test and urine test; 19,5% of mothers performed antenatal care 3 times or less, 80,5% of mothers performed antenatal care more than 4 times. Conclusion: The rate of mothers with correct and full knowledge of safe motherhood was very low, the rate of those who had at least 4 times of antenatal care during their pregnancy was quite high.
    Type of Medium: Online Resource
    ISSN: 2354-0613
    URL: Issue
    URL: Article
    DOI: 10.52163/jcm.v62i1
    DOI: 10.52163/jcm.v62i1.29
    Language: Unknown
    Publisher: Institute of Community Health
    Publication Date: 2020
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  • 7
    Online Resource
    Online Resource
    Current situation of health workers' knowledge and practice on safe motherhood at public health facilities of Ninh Binh province in 2019
    Institute of Community Health ; 2021
    In:  Tạp chí Y học cộng đồng Vol. 62, No. 2 ( 2021-04-30)
    Details
    In: Tạp chí Y học cộng đồng, Institute of Community Health, Vol. 62, No. 2 ( 2021-04-30)
    Abstract: Objective: To assess knowledge and practices on safe motherhood of mothers giving birth at public health facilities of Ninh Binh province in 2019. Subjects: Health workers working at public health facilities of the province. Rearch method: Descriptive cross-sectional survey. Results:When asked about the danger signs of mothers after giving birth that need to be monitored, the highest percentage is prolonged bleeding (94.3%), the lowest is prolonged abdominal pain (70.7%). In full body examination, the percentage of health workers who  practiced correctly was found the lowest for cardiopulmonary examination (49.0%), breast examination (58.0%), and the highest for blood pressure measurement (91.7%). Conclusion: The rate of health workers having correct knowledge on safe motherhood was not high. The rate of health workers having correct practice on prenatal check-up steps and asking steps ranged from 68.2% to 94.3%.
    Type of Medium: Online Resource
    ISSN: 2354-0613
    URL: Issue
    URL: Article
    DOI: 10.52163/jcm.v62i2
    DOI: 10.52163/jcm.v62i2.57
    Language: Unknown
    Publisher: Institute of Community Health
    Publication Date: 2021
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  • 8
    Online Resource
    Online Resource
    THỰC TRẠNG KIẾN THỨC VÀ THỰC HÀNH LÀM MẸ AN TOÀN CỦA CÁC BÀ MẸ SINH CON TẠI CƠ SỞ Y TẾ CÔNG TRÊN ĐỊA BÀN TỈNH NINH BÌNH NĂM 2019
    Institute of Community Health ; 2020
    In:  Tạp chí Y học Cộng đồng Vol. 62, No. 1 ( 2020-11-05)
    Details
    In: Tạp chí Y học Cộng đồng, Institute of Community Health, Vol. 62, No. 1 ( 2020-11-05)
    Abstract: Mục tiêu: Đánh giá kiến thức và thực hành làm mẹ an toàn của các bà mẹ sinh con tại cơ sở y tế công trên địa bàn tỉnh Ninh Bình năm 2019. Đối tượng nghiên cứu: Các bà mẹ sinh con tại cơ sở y tế công trên địa bàn tỉnh. Phương pháp nghiên cứu: Nghiên cứu mô tả qua cuộc điều tra cắt ngang. Kết quả nghiên cứu: Tỷ lệ bà mẹ hiểu đúng về LMAT khi được hỏi chiếm 38.4%; Có 97.5% bà mẹ cho rằng cần phải kiểm tra sức khỏe trước khi mang thai; Có 86.1% bà mẹ cho rằng cần thiết phải tiêm phòng trước khi mang thai; Có 60.2% bà mẹ có kiến thức đúng về việc khám thai cần thực hiện đầy đủ cả siêu âm, xét nghiệm máu và xét nghiệm nước tiểu; Có 19.5% bà mẹ thực hiện khám thai từ 3 lần trở xuống, có 80.5% bà mẹ thực hiện khám thai từ 4 lần trở lên. Kết luận: Tỷ lệ bà mẹ có kiến thức đúng và đầy đủ về LMAT còn rất thấp; tỷ lệ khám thai từ 4 lần trở lên trong suốt thai kì khá cao.
    Type of Medium: Online Resource
    ISSN: 2354-0613
    URL: Issue
    URL: Article
    DOI: 10.52163/yhcd.v62i1
    DOI: 10.52163/yhcd.v62i1.29
    Language: Unknown
    Publisher: Institute of Community Health
    Publication Date: 2020
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  • 9
    Online Resource
    Online Resource
    Thực trạng kiến thức, thực hành về làm mẹ an toàn của nhân viên y tế tại cơ sở y tế công trên địa bàn tỉnh Ninh Bình năm 2019
    Institute of Community Health ; 2021
    In:  Tạp chí Y học Cộng đồng Vol. 63, No. 2 ( 2021-04-30)
    Details
    In: Tạp chí Y học Cộng đồng, Institute of Community Health, Vol. 63, No. 2 ( 2021-04-30)
    Abstract: Mục tiêu: Đánh giá kiến thức và thực hành làm mẹ an toàn của các bà mẹ sinh con tại cơ sở y tế công trên địa bàn tỉnh Ninh Bình năm 2019. Đối tượng nghiên cứu: Các nhân viên y tế đang làm việc tại cơ sở y tế công trên địa bàn tỉnh. Phương pháp nghiên cứu: Phương pháp dịch tễ học mô tả qua cuộc điều tra cắt ngang. Kết quả nghiên cứu: Khi được hỏi về các dấu hiệu nguy hiểm của mẹ sau sinh cần theo dõi, tỷ lệ cao nhất là dấu hiệu chảy máu kéo dài (94.3%), thấp nhất là dấu hiệu đau bụng kéo dài (70.7%). Trong các nội dung khám toàn thân, tỷ lệ CBYT thực hành đúng thấp nhất là khám tim phổi (49.0%), khám vú (58.0%), cao nhất là bước đo huyết áp (91.7%). Kết luận: Tỷ lệ nhân viên y tế có kiến thức đúng về làm mẹ an toàn còn chưa cao. Cán bộ y tế thực hành đúng các bước khám thai, tỷ lệ thực hành đúng bước hỏi bệnh đạt từ 68.2% đến 94.3%.
    Type of Medium: Online Resource
    ISSN: 2354-0613
    URL: Issue
    URL: Article
    DOI: 10.52163/yhcd.v63i2
    DOI: 10.52163/yhcd.v63i2.57
    Language: Unknown
    Publisher: Institute of Community Health
    Publication Date: 2021
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  • 10
    Online Resource
    Online Resource
    ĐÁNH GIÁ KẾT QUẢ PHẪU THUẬT ĐIỀU TRỊ LÚN ĐỐT SỐNG DO LOÃNG XƯƠNG BẰNG PHƯƠNG PHÁP BƠM XI MĂNG SINH HỌC KHÔNG BÓNG TẠI BỆNH VIỆN ĐA KHOA TRUNG ƯƠNG CẦN THƠ NĂM 2021-2022
    Can Tho University of Medicine and Pharmacy ; 2022
    In:  Tạp chí Y Dược học Cần Thơ , No. 51 ( 2022-09-20), p. 163-168
    Details
    In: Tạp chí Y Dược học Cần Thơ, Can Tho University of Medicine and Pharmacy, , No. 51 ( 2022-09-20), p. 163-168
    Abstract: Đặt vấn đề: Lún đốt sống do loãng xương là nguyên nhân phổ biến nhất gây nên đau lưng ở người lớn tuổi. Điều trị bơm xi măng sinh học vào đốt sống được xem là cách điều trị ít xâm lấn và mang lại hiệu quả cao cho bệnh lý này. Mục tiêu nghiên cứu: Mô tả đặc điểm lâm sàng, cận lâm sàng và đánh giá kết quả điều trị bệnh lún đốt sống do loãng xương bằng phương pháp phẫu thuật bơm xi măng sinh học tại Cần Thơ từ 2021-2022. Đối tượng và phương pháp nghiên cứu: Nghiên cứu mô tả 35 bệnh nhân được chẩn đoán và phẫu thuật tại bệnh viện Đa khoa Trung ương Cần Thơ. Đánh giá kết quả hồi phục sau 24 giờ và sau theo dõi 3 tháng theo thang điểm đau hiển thị VAS và thang điểm Macnab. Kết quả: Tuổi trung bình là 69,91±10,70 tuổi. Tỉ lệ nữ/nam là 6/1. Mức độ lún đốt sống theo Genant (lún độ 1 là 65,26%, lún độ 2 là 28,06%, lún độ 3 là 6,68%. Kết quả sau mổ 24 giờ (thang điểm VAS) 3,97±0,71 điểm. Kết quả phẫu thuật sau 3 tháng: 71% rất tốt, 26% tốt, 3% trung bình, không có trường hợp nào xấu. Kết luận: Gãy lún thân đốt sống ở bệnh nhân loãng xương thường xảy ra ở người lớn tuổi. Kết quả phẫu thuật sau theo dõi 3 tháng hồi phục tốt hơn sau mổ 24 giờ.
    Type of Medium: Online Resource
    ISSN: 2354-1210
    URL: Issue
    URL: Article
    DOI: 10.58490/ctump.2022i51
    DOI: 10.58490/ctump.2022i51.326
    Language: Unknown
    Publisher: Can Tho University of Medicine and Pharmacy
    Publication Date: 2022
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