Integral manifolds for semilinear evolution equations and admissibility of function spaces

We prove the existence of integral (stable, unstable, and center) manifolds for the solutions to a semilinear integral equation in the case where the evolution family (U(t, s)) t≥s has an exponential trichotomy on a half line or on the whole line, and the nonlinear forcing term f satisfies the φ-Lipschitz conditions, i.e., where φ(t) belongs to some classes of admissible function spaces. Our main method is based on the Lyapunov–Perron methods, rescaling procedures, and the techniques of using the admissibility of function spaces.Доведено iснування iнтегральних (стiйких, нестiйких, центральних) многовидiв для розв’язкiв напiвлiнiйного iнтегрального рiвняння у випадку, коли сiм’я еволюцiй (U(t,s))tleqs має експоненцiальну трихотомiю на пiвосi або на всiй осi, а нелiнiйний збурюючий член f задовольняє φ-лiпшицевi умови, тобто належить до деяких класiв допустимих просторiв функцiй. Наш основний метод базується на методах Ляпунова – Перрона, процедурах перемасштабування та технiцi застосування допустимостi просторiв функцiй

Protein Structure and Enzyme Catalysis: Knowledge-Based Protein Loop Prediction and Ab Initio Equilibrium Constant Estimation

Prediction methods in the field of bioinformatics can be divided into ab initio and knowledge-based methods. The work in this thesis investigates the importance of anchor group positioning in knowledge-based protein loop prediction as well as the ab initio estimation of equilibrium constants using Density Functional Theory (DFT). The maximum possible prediction quality of knowledge-based loop prediction was examined for 595 insertions and 589 deletions with respect to gap length, fragment length, amino acid type, secondary structure and relative solvent accessibility while applying all possible anchor group positions for the fitting of loops between 3 and 12 residues in length. It was possible to predict 74.3 % of insertions and 83.7 % of deletions within an RMS deviation of < 1.5 Å between template and target structure using a knowledge-based fragment databank based on structures of the Protein Databank (PDB). The analysis showed that the importance of anchor group positioning increases with gap length and that medium fragments with lengths between 5-8 residues perform better than shorter or longer fragments. In addition, better predictions were obtained when anchor groups consisted of hydrophobic residues, were located within secondary structures such as helices and beta sheets, or had low relative solvent accessibilities. A test based on targeted anchor group selection using a combination of the above criteria showed an improvement in prediction quality compared to a random selection of anchor groups. Density Functional Theory (DFT) with a b3lyp/6-311g++ (d,p) basis set was used in combination with a preceding molecular mechanics conformational search to estimate the standard transformed Gibbs free energies of reaction (dGr°') for a set of 45 enzyme-catalyzed reactions at standard biochemical conditions (pH 7 and 298.15 K). For reactions from EC group 1 and EC groups 5 and 6, the calculated dGr°' values deviated from the experimental values by an average of 2.49 kcal/mol and 5.50 kcal/mol, respectively. This data was comparable to the values calculated using group contribution method by Mavrovouniotis (Mavrovouniotis, J.Biol.Chem 1991; 266:14440-45), where the mean error was 2.76 kcal/mol for reactions from EC group 1 and 4.76 kcal/mol for reactions from EC groups 5 and 6. The mean error for the entire set of reactions was 10.30 kcal/mol. These results are very promising, considering that purely structural information was used, and the method can be improved by further optimization

MỘT SỐ ĐẶC ĐIỂM SINH HỌC CỦA LOÀI CÁ NỤC SỒ DECAPTERUS MARUADSI (TEMMINCK & SCHLEGEL, 1843) Ở VÙNG BIỂN VỊNH BẮC BỘ

Biological characteristics of the round scad Decapterus maruadsi (Temminck Schlegel, 1843) were analyzed using data collected by Vietnam - China Corporation Survey Project for the Marine Fisheries Resources Assessment in the Common Fishing Zone in the Gulf of Tonkin. Biological samples were monthly and randomly collected from the catches of trawl fisheries in Cat Ba island (Hai Phong) and Lach Hoi, Lach Bang (Thanh Hoa province). There were a total of 7,614 individuals of round scad collected in the period from 2012 - 2013. The result showed that the fork length of fish varied in range of 45 - 262 mm with the mean length from 166 - 167 mm. The Von Bertalanffy growth function of round scad was expressed as . Round scad spawned once a year with the spawning season extending from January to April and reaching a peak in March. The estimated length at first maturity (Lm50) was 160.96 mm for female and 161.37 mm for male.Đặc điểm sinh học của cá nục sồ Decapterus maruadsi (Temminck Schlegel, 1843) được phân tích dựa trên số liệu sinh học nghề cá do dự án điều tra liên hợp Việt - Trung “Đánh giá nguồn lợi hải sản trong vùng đánh cá chung vịnh Bắc Bộ” thu thập trong giai đoạn 2012 - 2013. Hàng tháng, mẫu sinh học được thu thập ngẫu nhiên từ sản lượng khai thác của các đội tàu kéo đáy ở Cát Bà (Hải Phòng) và Lạch Hới, Lạch Bạng (Thanh Hóa). Trong giai đoạn 2012 - 2013, đã thu thập và phân tích tổng số 7.614 cá thể cá nục sồ. Kết quả nghiên cứu cho thấy chiều dài cá bắt gặp trong sản lượng khai thác dao động trong khoảng từ 45 - 262 mm. Kích cỡ trung bình thu được khoảng 166 - 167 mm. Phương trình sinh trưởng Von Bertalanffy của cá nục sồ có dạng . Mùa sinh sản của cá nục sồ kéo dài trong khoảng từ tháng 1 đến tháng 4 hàng năm với đỉnh sinh sản ở tháng 3. Chiều dài lần đầu sinh sản của cá cái ước tính là 160,96 mm và cá đực là 161,37 mm

Accurate Phase Calibration for Digital Beam-Forming in Multi-Transceiver HF Radar System

The TIGER-3 radar is being developed as an “all digital” radar with 20 integrated digital transceivers, each connected to a separate antenna. Using phased array antenna techniques, radiated power is steered towards a desired direction based on the relative phases within the array elements. This paper proposes an accurate phase measurement method to calibrate the phases of the radio output signals using Field Programmable Gate Array (FPGA) technology. The method sequentially measures the phase offset between the RF signal generated by each transceiver and a reference signal operated at the same frequency. Accordingly, the transceiver adjusts its phase in order to align to the reference phase. This results in accurately aligned phases of the RF output signals and with the further addition of appropriate phase offsets, digital beamforming (DBF) can be performed steering the beam in a desired direction. The proposed method is implemented on a Virtex-5 VFX70T device. Experimental results show that the calibration accuracy is of 0.153 degrees with 14 MHz operating frequency

ARSENIC REMOVAL FROM WATER BY CHEMICAL OXIDATION AND ADSORPTION ON IN-SITU FORMED FERRIC HYDROXIDE

Joint Research on Environmental Science and Technology for the Eart

Childhood Acute Poisoning at Haiphong Children\u27s Hospital: A 10-Year Retrospective Study

INTRODUCTION: Children are most often harmed by acute poisoning, which may cause disability or even death. This demonstrates the critical necessity for epidemiologic studies specific to each nation and area since they aid in developing plans for the prevention of acute poisoning. There are no data or outdated data on acute poisoning in children in Vietnam. This research would partly fill this existing gap and compare the trend with other places across the globe. METHODS: A retrospective study was conducted in the 10-year period from 2012 to 2021 in Haiphong Children\u27s Hospital, Vietnam. RESULTS: There were 771 children hospitalized due to acute poisoning. Children in the 1-5-year-old group accounted for the highest rate, at 506 (65.6%). The mean age was 4.5 ± 4.1 years old. The male-to-female ratio was 1.2/1. Nonpharmaceutical chemicals were the most common agent in 331 cases (42.9%), including cleaning products 63 (19.0%), rat poison 60 (18.1%), and petrol 42 (12.7%). Medications were the second most common agent in 290 cases (37.6%), mostly paracetamol 60 (20.7%) and sedatives 40 (13.8%). There were 633 (82.1%) children exposed to poisons unintentionally. CONCLUSION: Children between the ages of 1 and 5 are more likely to be exposed to harmful substances. The most common agents were nonpharmaceutical chemicals followed by pharmaceuticals. Most incidents were inadvertent. Finally, our research may provide insights that public health authorities might use to plan practical actions

Cooperative transmission in cloud RAN considering fronthaul capacity and cloud processing constraints

We investigate the cooperative transmission design for the cloud radio access network (C-RAN) considering fronthaul capacity and cloud processing constraints. Specifically, we consider the joint transmission scheme where the baseband signals and precoding vectors are processed and calculated by the cloud, which are delivered over the fronthaul links to the remote radio heads (RRHs) to form the RF signals for being transmitted to the users. We formulate the joint optimization problem for precoding design and allocation of RRHs, fronthaul capacity, and BBU processing resources to minimize the total transmission power subject to QoS constraints of the users. We present both optimal exhaustive search algorithm and two low-complexity algorithms to solve the resource allocation problem where the first one can achieve the Pareto optimality and the second one can determine an efficient solution with pretty low complexity. Numerical results confirm the excellent performance of the proposed low-complexity algorithms

PROVISION CAPACITY OF SERVICE DELIVERY FACILITIES FOR CHILDREN WITH HEARING LOSS IN HAI PHONG, VIETNAM

Objective: Hearing loss is a commonly occurring disability that affects 466 million people worldwide. This study aimed at determining the actual situations of early intervention delivery facilities for children with hearing loss. Out of this affected population, 7% are children (34 million) who, along with their families, grapple with the serious lifelong problems that accompany the disease. Methods: This descriptive cross-sectional study was conducted with facilities investigated consisting of a school for the deaf, hospitals, an audiology center, and a social agency in Hai Phong province from January 2013 to December 2014. A sample composed of 353 children was also recruited. Results: The examined facilities suffer from shortcomings in provision capacity, which manifest in deficient materials, supplies and equipment, and human resources; the lack of interdisciplinary coordination of activities; inadequate community awareness; and the unaddressed need for early detection and intervention. The conditions of most of the children (98%) were detected by their families, and among those who were clinically diagnosed, the majority (76.8%) received such diagnosis at central hospitals. Hearing impairment among the children were detected, diagnosed, and subjected to intervention at a very late stage (on average, at ages 22.3, 34, and 32.5 months, respectively), thereby compelling up to 63.6% of the families to struggle with their children’s hearing loss. Conclusion: Solutions to current interventions are needed to enhance service delivery systems and guarantee early detection as well as timely and appropriate treatment

ARSENIC REMOVAL FROM GROUNDWATER BY IRON CO PRECIPITATION IN CONTACT FILTER

Joint Research on Environmental Science and Technology for the Eart