On January 18th, according to China Railway, starting from January 19th, the China Railway 12306 platform (including website and App) officially launched a new service for passengers - free ticket refund within a limited time for mistaken purchases.

According to information released by the railway department, when passengers purchase train tickets on or after February 2nd through the 12306 platform, if they make a mistake, they can apply for a free refund online within 30 minutes after payment is successful and at least 4 hours before departure, without having to pay a refund fee.

The railway department stated that this service optimization aims to further enhance the ticket purchasing experience of passengers and proactively adapt to diversified travel needs. After preliminary research and system upgrades, this feature primarily provides convenience for passengers who may make incorrect operations during the ticket purchasing process. The applicable ticket range includes domestic passenger train tickets with travel dates on or after February 2nd, as well as cross-border train tickets with the starting or ending station being Hong Kong West Kowloon. After purchasing tickets using electronic payment or points, passengers who meet the aforementioned time conditions can self-handle free ticket refunds through online channels. Refunds made using electronic payment will be returned via the original payment method, while those made using points will be refunded with corresponding points, and the validity period of the points will remain unchanged.

The same ticket purchaser is limited to handling only one free ticket refund for mistaken purchase within a natural day, and ticket rebooking, ticket booking reservation, or waiting list ticket purchase are not within the scope of this service.

In addition, the tiered refund policy currently implemented by the railway remains effective. Passengers who apply for refunds within the stipulated free refund period will not use up the number of free refunds for mistaken purchases. If a passenger makes a mistaken purchase at a ticket window at the station, they must inform the staff on the spot so that the correct ticket can be issued in a timely manner.

The railway department stated that the launch of this service will help reduce the economic losses caused to passengers due to mistaken ticket purchases, and better safeguard passengers' rights and interests. Moving forward, the railway department will continue to monitor the operation of this service, collect feedback from passengers, further optimize the functions and services of the 12306 platform, and ensure that passengers can travel safely, orderly, and comfortably during the Spring Festival travel rush.

On November 30, according to the official account of "China Communications First Highway Engineering Group," the "underwater connection section" of the Jiangyin-Jingjiang Yangtze River Tunnel, constructed by the Tunnel Bureau of China Communications First Highway Engineering Group, was officially completed on November 29. This marks the full completion of the tunnel's main structure. The project team successfully solved the world-class challenge of shield tunneling "underwater connection" in high water pressure and highly permeable strata, representing a historic breakthrough in China's tunnel engineering construction field.

According to the introduction, the shield section of the project tunnel is 4,937 meters long, with a digging diameter of 16.09 meters and a maximum water pressure of 0.82 megapascals. It was the largest-diameter and highest-water-pressure highway shield tunnel under construction in China at that time. Among them, the water pressure at the river bottom connection section is as high as 0.76 megapascals, equivalent to a continuous pressure of about 76,000 kilograms per square meter on the shield shell. The connection section is located in a high-water-pressure and highly-permeable soft soil layer, making it extremely difficult to control the stability of the shield body and the tunnel. The technical difficulty far exceeds the existing tunnel construction technology scope, and it is a highly risky and extremely complex comprehensive project. There are no implementation standards or reference engineering cases at home and abroad.

According to the official press release, China Communications First Highway Group Co., Ltd. has established a precise control network to accurately capture the position and posture of the shield machine in real time. It has independently developed a visualization system for opposite-direction tunneling to collect and present data, comprehensively monitoring the tunneling process and promptly adjusting parameters such as the advancement speed and direction. This has enabled a high-precision connection with a horizontal deviation of 0 millimeters and a vertical deviation of 2 millimeters, far exceeding the design value of 100 millimeters. Further innovations in the asymmetric asynchronous freezing scheme were made, with 363 high-precision drilling and core sampling operations carried out to ensure that the freezing effect met the design standards. With the completion of the excavation, support, and main drive rotation of the connection section, all major risks were eliminated. Finally, on November 29th, the entire "underwater connection section" was completed.

The underwater connection project of the Jiangyin-Jingjiang Yangtze River Tunnel represents the highest level of China's shield machine underground connection technology. From design concept, construction technology to risk control, the project has formed a complete set of technologies for the connection of 16-meter-class shield machines in high-pressure water and highly permeable sand layers under the riverbed. This technological achievement has broken through the length limit of single shield machine's continuous excavation, making long-distance shield tunnels possible. It has significant advantages in terms of cost, construction period, construction organization, risk control, and environmental protection. It provides a replicable and scalable model for the construction of cross-river and cross-sea tunnels in complex geological conditions for the industry. It has reserved key technological achievements and practical experience for promoting the development of deep, large-section, and long-distance shield tunnel technology at home and abroad, as well as for the future planning and construction of super cross-river and cross-sea projects.

The Jiangyin-Jingjiang Yangtze River Tunnel is one of the key projects of the comprehensive three-dimensional transportation corridor in the Yangtze River Economic Belt planned by the State Council. Once completed, it will effectively enhance the capacity of the Yangtze River trunk line's cross-river passage.

Foreign Ministry spokesman Wang Wenbin said at a regular press conference on August 31 that China will hold the third the Belt and Road Forum for International Cooperation in Beijing in October this year. This is not only the most grand event to commemorate the 10th anniversary of the "the Belt and Road" initiative, but also an important platform for all parties to discuss and jointly build high-quality "the Belt and Road" cooperation.

Wang Wenbin said that the "the Belt and Road" initiative, with connectivity as the main line, aims to provide a new platform for international economic cooperation and new impetus for the development of countries and world economic growth. In the past 10 years, the "the Belt and Road" has become a popular global public product and international cooperation platform.

openssl 是目前最流行的 SSL 密码库工具，其提供了一个通用、健壮、功能完备的工具套件，用以支持SSL/TLS 协议的实现。
官网：https://www.openssl.org/source/

$ openssl
OpenSSL> genrsa -out private_key.pem 2048
Generating RSA private key, 2048 bit long modulus
....................+++
...........................................................................+++
e is 65537 (0x10001)
OpenSSL> rsa -in private_key.pem -pubout -out public_key.pem
writing RSA key
OpenSSL> exit
$ ls
private_key.pem public_key.pem

经过上述命令可生成私钥和公钥证书，查看字符串可以使用记事本等编辑器打开即可

Recently, the enterprise of Beidou Xingtong and Xinxingtong recently released a new generation of ultra-small full-system multi-frequency and high-precision RTK positioning module UM960, which provides high-fixed rate, high-precision and reliable GNSS positioning data for intelligent robots, deformation monitoring, unmanned aerial vehicles, handheld GIS and other fields.

The size of the UM960 is 12mm16mm2.6mm, which can bring greater freedom and flexibility to the customer's hardware design. While reducing the difficulty of integration, it can make the terminal product design more integrated and smaller in size, so as to expand to more application scenarios.

Compared with the previous generation of star products, the UM960 cloth plate area has decreased by 84%, and the smaller cloth plate area can also bring cost savings to customers.

The UM960 independently developed by Hexinxingtong supports Beidou, GPS, Galileo, GLONASS and QZSS navigation systems, and the frequency points support BDS B1I/B2I/B3I/B1c/B2a *, GPS L1/L2/L5, Galileo E1/E5b/E5a, GLONASS G1/G2, QZSS L1/L2/L5. The support of multi-frequency points in the whole system enables the UM960 to obtain more available satellites and observations under the same occlusion conditions, improve its data availability under severe occlusion scenarios, improve the fixed rate, and meet the application requirements of various scenarios in different regions.

Thanks to the powerful chip performance of Nabulas IV, the overall performance of UM960 has been significantly improved. The UM960 floating-point computing power has been increased by 5 times, the module computing power has been greatly improved, and the RTK solution time has been greatly shortened; In terms of data output, it supports single point positioning+RTK positioning data 20HZ stable output. In addition, UM960 supports 1408 channels to meet the expansion needs of current and future frequency points.

The UM960 ensures that the power consumption is less than 450mW in the case of small size, which is 75% lower than the previous generation of products, and can better meet the industrial application requirements with strict power consumption requirements. The low power consumption feature of UM960 is conducive to solving the problem of working hours of handheld portable devices and other industrial products. In deformation monitoring and other industries, low power consumption can help customers reduce costs.

UM960 supports independent tracking and acquisition of each frequency point. When a certain frequency point is interfered, other frequency points still work normally to ensure that UM960 module can still locate normally in the interference environment.

The UM960 interference detection function can visually display the intensity of interference signals in the current environment. In the performance UAV industry, the environment can be detected before the flight performance to effectively prevent the occurrence of flight accidents; When mapping the location of CORS stations, it is necessary to confirm whether the environment is clean. The UM960 interference detection function can easily detect whether there is interference in the environment, effectively shorten the initial location time of CORS stations, and save the cost of site selection and station construction.

Based on its excellent performance, UM960 can also solve the application pain point problem of low fixed rate and poor accuracy in severe occlusion scenarios, and provide accurate and reliable positioning data for terminal products.