Optics

In this paper, we propose an effective AMC using deep learning (DL) for flexible and adaptive OFDM-based optical networks. The proposed DL-based AMC is able to classify four typical modulation schemes such as binary phase-shift keying (BPSK), quadrature PSK (QPSK), 8-PSK, and 16- quadrature amplitude modulation (QAM) in dynamic network conditions.

6p viengfa 28-10-2024 3 2   Download

This paper presents a design study of a wavelengthrouted optical router based on flat waveguide components on the Silicon-on-Insulator (SOI) platform compatible with CMOS fabrication processes. The design incorporates Arrayed Waveguide Gratings (AWG), Bragg scattering gratings, and is assisted by resonant ring couplers.

8p viengfa 28-10-2024 4 2   Download

This study was conducted. Moreover, it is shown that choosing the best Tx/Rx parameters is necessary to meet service quality requirements such as BER and transmission confidentiality. The provided findings provide insightful information about the practical considerations of deploying UWOC/ CDMA systems.

11p viengfa 28-10-2024 3 1   Download

Silver nanoparticles (Ag NPs) with a size of around 9 nm were fabricated and quantified through fluorescence quenching of rhodamine B (RhB). A series of solutions composed of RhB with various concentrations of Ag NPs ranging from 0.09 pM to 0.98 pM were prepared, and optical properties were investigated by absorption and fluorescence spectroscopies.

8p viengfa 28-10-2024 5 2   Download

We calculate the exciton radiative lifetime of spherical Indium Phosphide (InP) and Cadmium Selenide (CdSe) colloidal quantum dots. In experiments, InP and CdSe quantum dots can be coated by another semiconductor shell, organic ligands, or inorganic molecules.

7p viengfa 28-10-2024 2 0   Download

Bài giảng "Hóa hữu cơ 1" Chương 5 - Hóa học lập thể, được biên soạn gồm các nội dung chính sau: Đối phân (enantiomer) và carbon tứ diện; Nguyên nhân của tính thủ tính trong phân tử (chirality); Tính quang hoạt (optical activity); Tính chất của hai đối phân; Quy tắc để xác định cấu hình. Hệ thống Cahn-Ingold-Prelog;...Mời các bạn cùng tham khảo!

39p laphongtrang0906 03-04-2025 2 1   Download

ZnO nanostructures have been fabricated by annealing zinc acetate dihydrate at different temperatures (Tan). Thermogravimetric analysis, and XRD and Raman studies indicate ZnO crystals formed at above 250oC.

15p vimitsuki 30-03-2025 8 0   Download

In this work, we present a comprehensive optical simulation analysis of bulkheterojunction (BHJ) organic solar cells where PBDB-T:ITIC incorporated with PTB7:PC71BM blends served as photoactive layers. The simulations were performed using transfer matrix method implemented through a MATLAB script that is developed by McGehee’s research group at Stanford University.

12p vimitsuki 30-03-2025 1 1   Download

Chấn thương sọ não là bệnh lý phổ biến trên toàn cầu và Việt Nam với xu hướng tăng nhanh cả về số lượng, độ nặng và là một trong các nguyên nhân hàng đầu gây tử vong và tàn phế đặc biệt đối với các đối tượng trẻ tuổi. Bài viết trình bày đánh giá mối tương quan giữa đường kính bao dây thần kinh thị giác đo bằng siêu âm với áp lực nội sọ ở bệnh nhân chấn thương sọ não nặng.

5p visarada 28-03-2025 3 1   Download

In this study, we synthesized YPO4:x%Tb3+ using the combustion synthesis method and investigated the effects of annealing temperature and dopant concentration on the structural, morphological, and optical properties of the material.

8p viaburame 14-03-2025 2 0   Download

The paper builds a computational model of a multisubcarrier free space optic, a variant of the Subcarrier Intensity Modulation Free Space Optic (SIM-FSO), establishes algorithmic flowcharts, writes a computational program to investigate the system performance under various modulation methods, air turbulence levels and different numbers of subcarriers and data rates.

6p viaburame 14-03-2025 6 1   Download

In the present work, CeO2 with different loading was embedded on reduced graphene oxide (rGO) by a simple one-pot hydrothermal method. The synthesized samples were characterized using XRD, EDX mapping, FESEM, and UV-Vis DRS techniques.

11p vifilm 11-10-2024 4 1   Download

Bài viết trình bày mô tả sự thay đổi mạch máu võng mạc và hắc mạc vùng hoàng điểm ở bệnh nhân (BN) cận thị nặng với máy chụp mạch máu cắt lớp cố kết quang học (optical coherence tomography angiography - OCT-A).

9p vihyuga 20-02-2025 3 1   Download

This paper is about a new microstructure design that uses a Laser Diode (LD) light source for Liquid Crystal Displays (LCDs). It shows an important step forward in display technology. Regular Thin-Film Transistor LCDs often have efficiency problems because of multilayer optical films, causing loss of light and reduced performance.

11p viyamanaka 06-02-2025 4 2   Download

This study compared results of online circular contrast perimetry (OCCP) versus standard automated perimetry (SAP) in clinic, as well as clinic OCCP versus home OCCP in a normal Asian population. Healthy participants underwent a comprehensive ocular examination, retinal nerve fiber layer optical coherence tomography scan, and visual field tests performed in clinic, using OCCP and SAP.

10p viyamanaka 06-02-2025 7 2   Download

This study involved the deposition of NiO thin films onto Al2O3/glass substrates using RFmagnetron reactive sputtering. Then, the influence of heating temperatures on crystal structure, surface morphology, transmittance, and optical band gap of NiO films was investigated via different characterization techniques.

8p tuetuebinhan000 23-01-2025 5 2   Download

IHC has became an indispensable tool adjunct to the conventional pathology in daily practice. This technique is called immunohistochemistry because it was combined by two aspects including immunology and histochemistry applied directly on the tissue (taken from the patient lesion) section embedded in paraffin.

4p viuchiha 06-01-2025 1 1   Download

Nút mạng: PCs, Laptop, Routers, Server.Liên kết : kênh truyền thông giữa các nút kế tiếp. Hữ tuyến: Ethernet Lan, ADSL, fiber optic.Không dây: wi- fi, WI- Max. vệ tinh. Tâng liên kết dữ liệu giữa các thành phần kế tiếp . Các chức năng(1) đóng gói - framing: đơn vị dữ liệu: Frame( khung tin). Bên gửi: đặt gói tin tầng mạng vào khung thêm phần đầu, phần đuôi

54p javefit 04-09-2012 112 15   Download

This short book is my answer to their question. This book will reference modern research, but it is not a book for scholars. This book will contain information that will benefit English teachers, but it is not a book for teachers. This is a book for you, the student. In my reading, much of the literature concerning language acquisition theory and research are designed for teachers.

225p blackjame2008 22-04-2010 343 213   Download

A bit (binary digit) is the smallest unit of information • N = 2n where N is the number of representations and n is the number of bits (ex. ASCII, Unicode, PCM code etc.) • Data communications transfer information using codes that are transmitted as signals (either analog or digital) • In general, analog lines provide a slow service that contains high error rates.

59p trungkiendt9 24-04-2011 102 18   Download