Black holes

Cuốn sách "Cuộc chiến lỗ đen" của tác giả Leonard Susskind nói về sự khám khá tuyệt vời của loài người với thế giới bí ẩn của vũ trụ và các định luật của tự nhiên. Đó là sự lý giải về một thế giới ở quá xa các giác quan của chúng ta, là xem xét các đối tượng nhỏ hơn hàng trăm tỉ tỉ lần so với một prôton.

278p zizaybay1102 20-05-2024 7 3   Download

Part 2 book "Relativity demystified - A self teaching guide" includes content: The energy momentum tensor, killing vectors, null tetrads and the petrov classification, the schwarzschild solution, black holes, cosmology, gravitational waves.

191p muasambanhan07 08-02-2024 0 0   Download

Part 2 book "String theory demystified" includes content: Compactifi cation and T-Duality, superstring theory continued, a summary of superstring theory, type II string theories, heterotic string theory, D-branes, black holes, the holographic principle and AdS/CFT correspondence, string theory and cosmology.

154p muasambanhan07 08-02-2024 4 0   Download

Part 2 book "A detailed introduction to string theory" includes content: T-Duality, symmetries, and compactification; a crash course in supersymmetry; an introduction to superstrings; the thermodynamics of strings; elements of differential geometry; a crash course on general relativity;.... and other contents.

291p muasambanhan06 03-02-2024 3 1   Download

In this paper, a typical representation of the nature-inspired evolved antenna is investigated and developed. The Black Hole (BH), a space-operated phenomenon, is used as an evolutionary algorithm to optimize the antenna structure.

8p vijeff 30-11-2023 5 3   Download

Continued part 1, part 2 of ebook "Introduction to general relativity: A course for undergraduate students of physics" provides readers with contents including: Chapter 9 - Classical tests of general relativity; Chapter 10 - Black holes; Chapter 11 - Cosmological models; Chapter 12 - Gravitational waves; Chapter 13 - Beyond Einstein's gravity;...

168p dangsovu 20-10-2023 5 3   Download

Since the dawn of humankind, people have looked upward to the heavens and tried to understand them. This encyclopedia takes you on an expedition through time and space to discover our place in the universe. We invite you to take a journey through the wonders of the universe. Explore the cosmos, from planets to black holes, the Big Bang, and everything in-between! Get ready to discover the story of the universe one page at a time! This educational book for young adults will launch you on a wild trip through the cosmos and the incredible discoveries throughout history.

143p haojiubujain03 09-08-2023 5 3   Download

Mạng tùy biến di động (MANET) là sự kết hợp của các thiết bị có khả năng di động, kết nối với nhau để truyền thông qua môi trường không dây. Bài viết Một số hình thức tấn công trên mạng MANET trình bày chi tiết cách thức thực hiện một số hình thức tấn công như black hole, sink hole, gray hole, flooding, và worm hole.

6p vispyker 16-11-2022 17 5   Download

In this paper, we implement and analyses performance of multiple black hole attack nodes simultaneously in AODV routing protocol in terms of throughput, energy efficiency and data packet delivery. Our simulation results show that the more attackable nodes in network simultaneously, the lower the energy efficiency and network performance.

7p chauchaungayxua11 23-03-2021 9 2   Download

In this paper, we measured multiple black hole attacks simultaneously in Network Simulator 2 (NS2) in terms of throughput, energy efficiency and data packet delivery. We also proposed a simple solution for detection and avoidance black hole attacks.

7p chauchaungayxua11 23-03-2021 15 4   Download

In this paper, a new hybrid meta-heuristic algorithm for FCP called BHHS which combines the power of existing meta-heuristic frameworks such as Black Hole and Harmony Search is proposed. These two algorithms cooperate and support each other. The Black Hole part of the algorithm has the goal to find good candidate solution while the Harmony Search part has the goal to generate new candidate solutions for Black Hole when the event horizon of the Black Hole occurs. In addition, new best solutions of these two components are exchanged with each other to improve the quality of the search.

7p chauchaungayxua11 23-03-2021 15 1   Download

Bài viết tập trung trình bày cách thức thực hiện một số hình thức tấn công như black hole, sink hole, gray hole, flooding, và worm hole. Đề xuất các hướng nghiên cứu nhằm phòng chống các hình thức tấn công kể trên.

7p vijersey2711 02-03-2021 18 2   Download

The thermodynamic properties of matter outside of the 4-dimensional Reissner-Nordström (RN) charged black hole have been investigated. Has shown that matter have similar properties to Van der Walls fluid and with temperatures T less than the critical temperature Tc there exists a gas-liquid phase transition.

6p vioregon2711 19-02-2021 14 1   Download

In this paper, continuing the research direction done in we consider further on phase structure of Reissner-Nordstr¨om charged black hole. The results show that there is a transition between small and large black holes (with horizonal radius change), the system share the same oscillatory behavior in pressure-volume graph, in temperature-entropy graph.

8p koxih_kothogmih5 04-09-2020 11 1   Download

In this paper, based on the vector model for gravitational field we deduce an equation to determinate the metric of space-time. This equation is similar to equation of Einstein. The metric of space-time outside a static spherically symmetric body is also determined. It gives a small supplementation to the Schwarzschild metric in General theory of relativity but the singularity does not exist. Especially, this model predicts the existence of a new universal body after a black hole.

10p nguyenxuankha_bevandan 14-08-2020 16 2   Download

The purpose of this study was to investigate canal configuration of mandibular first premolars in an Egyptian population. Two hundred fifty human extracted mandibular first premolars were collected from Egyptian patients and a small hole in the center of the occlusal surface of each tooth was made perforating the roof of the pulp chamber. Teeth were decalcified by immersing in nitric acid and dehydrated in ascending concentrations of ethyl alcohol.

6p kethamoi1 17-11-2019 15 0   Download

The “Monstrous Moonshine” conjecture (now a theorem) of Conway and Nortan has given rise to a large body of new mathematics. This theorem has been extended to other groups revealing unexpected relations to conformal field theory, quantum gravity, black holes, and string theory in physics and to Ramanujan’s mock theta functions and its extensions in mathematics.

11p viryucha2711 24-04-2019 18 0   Download

Denial–Of-Service (DOS) attacks are detected on network layer which are namely as gray hole attack, black hole attack and worm hole attack. We have surveyed research papers based on detection of gray hole attack in MANET. This survey paper analyze the gray hole attack detection technique on AODV routing protocol.

4p hongnhan878 12-04-2019 18 0   Download

In this study using black hole algorithm (BHA), we determine the number and location of the cluster heads to the best optimization. Fitting the criterion will be based on the minimum consumed energy of each node in the network in every data transmission operation period that will be led to the creation of a balance in energy consumption of cluster heads and consequently longer life of network

5p byphasse043256 23-03-2019 16 0   Download

(bq) part 2 book "a first course in string theory" has contents: d-branes and gauge fields, string charge and electric charge, t-duality of closed strings, t-duality of open strings, electromagnetic fields on d-branes, string theory and particle physics, string thermodynamics and black holes,...and other contents.

345p bautroibinhyen19 02-03-2017 57 6   Download