Experimental and simulation study on nonlinear pitch control of Seagull underwater glider

1008-1015The Seagull underwater glider, developed by the Shanghai Jiao Tong University, is designed as a test-bed glider for the development and validation of various algorithms to enhance the glider’s long-term autonomy. In this paper, an adaptive backstepping control (ABC) method is proposed for the nonlinear pitch control of the underwater glider gliding in the vertical plane. The linear quadratic regulator (LQR) control and proportional-integral-derivative (PID) control are applied and evaluated with the ABC method to control a glider in saw-tooth motion. Simulation results demonstrate inherent effectiveness and superiority of the LQR or PID based method. According to Lyapunov stability theory, the ABC control scheme is derived to ensure the tracking errors asymptotically converge to zero. The ABC controller has been implemented on Seagull underwater glider, and verified in field experiments in the Qiandao Lake, Zhejiang

Sequential Reassortments Underlie Diverse Influenza H7N9 Genotypes in China

Initial genetic characterizations have suggested that the influenza A (H7N9) viruses responsible for the current outbreak in China are novel reassortants. However, little is known about the pathways of their evolution and, in particular, the generation of diverse viral genotypes. Here we report an in-depth evolutionary analysis of whole-genome sequence data of 45 H7N9 and 42 H9N2 viruses isolated from humans, poultry, and wild birds during recent influenza surveillance efforts in China. Our analysis shows that the H7N9 viruses were generated by at least two steps of sequential reassortments involving distinct H9N2 donor viruses in different hosts. The first reassortment likely occurred in wild birds and the second in domestic birds in east China in early 2012. Our study identifies the pathways for the generation of diverse H7N9 genotypes in China and highlights the importance of monitoring multiple sources for effective surveillance of potential influenza outbreaks.National Natural Science Foundation (China) (31125016)National Natural Science Foundation (China) (31371338)National Center for Biotechnology Information (U.S.) (Major National Earmark Project for Infectious Diseases, 2013ZX10004611-002)National Basic Research Program of China (973 Program)National Basic Research Program of China (973 Program, grant, 2009CB918503)National Science and Technology Major Projects (2012ZX10004214001002)Jiangsu Sheng (China) (Priority Academic Program Development of Jiangsu Higher Education Institutions)National Natural Science Foundation (China) (31100950)MIT International Science and Technology Initiative

Large expert-curated database for benchmarking document similarity detection in biomedical literature search

Document recommendation systems for locating relevant literature have mostly relied on methods developed a decade ago. This is largely due to the lack of a large offline gold-standard benchmark of relevant documents that cover a variety of research fields such that newly developed literature search techniques can be compared, improved and translated into practice. To overcome this bottleneck, we have established the RElevant LIterature SearcH consortium consisting of more than 1500 scientists from 84 countries, who have collectively annotated the relevance of over 180 000 PubMed-listed articles with regard to their respective seed (input) article/s. The majority of annotations were contributed by highly experienced, original authors of the seed articles. The collected data cover 76% of all unique PubMed Medical Subject Headings descriptors. No systematic biases were observed across different experience levels, research fields or time spent on annotations. More importantly, annotations of the same document pairs contributed by different scientists were highly concordant. We further show that the three representative baseline methods used to generate recommended articles for evaluation (Okapi Best Matching 25, Term Frequency-Inverse Document Frequency and PubMed Related Articles) had similar overall performances. Additionally, we found that these methods each tend to produce distinct collections of recommended articles, suggesting that a hybrid method may be required to completely capture all relevant articles. The established database server located at https://relishdb.ict.griffith.edu.au is freely available for the downloading of annotation data and the blind testing of new methods. We expect that this benchmark will be useful for stimulating the development of new powerful techniques for title and title/abstract-based search engines for relevant articles in biomedical research.Peer reviewe

Renal Pelvic Carcinosarcoma: One Case Report and Literature Review

Renal pelvic carcinosarcoma (RPCS) is rare in clinic, and difficultto make preoperative diagnosis. One patient diagnosed as RPCS wastreated in our hospital in August 2008. We made it as a case report asfollows

RealSee: Navigating the Digital Transformation of Real Estate and Beyond

RealSee is a leading provider of integrated digital space solutions in China. Established in 2017 as a subsidiary of Ke Holdings Inc, RealSee specializes in catering to the second-hand housing and rental market as well as new home market. Leveraging Ke Holdings' home dictionary and other housing information databases, RealSee developed a range of innovative commercial products including VR property showing, AI property explanations, VR tours, and AI design, all aimed at enhancing the house viewing experience for users and improving the efficiency of real estate agents. In 2022, RealSee transitioned to become an independent entity separate from Ke Holdings. This move marked the beginning of RealSee's venture into the commercial exploration of three-dimensional (3D) space construction in industries beyond real estate. However, without the support it had previously received from Ke Holdings, which played a vital role in its development, RealSee now faces the challenge of generating revenue independently. Furthermore, RealSee must prioritize the delicate balance between short-term commercialization objectives and long-term development strategy to ensure sustainable growth

RealSee: Navigating the Digital Transformation of Real Estate and Beyond

RealSee is a leading provider of integrated digital space solutions in China. Established in 2017 as a subsidiary of Ke Holdings Inc, RealSee specializes in catering to the second-hand housing and rental market as well as new home market. Leveraging Ke Holdings' home dictionary and other housing information databases, RealSee developed a range of innovative commercial products including VR property showing, AI property explanations, VR tours, and AI design, all aimed at enhancing the house viewing experience for users and improving the efficiency of real estate agents. In 2022, RealSee transitioned to become an independent entity separate from Ke Holdings. This move marked the beginning of RealSee's venture into the commercial exploration of three-dimensional (3D) space construction in industries beyond real estate. However, without the support it had previously received from Ke Holdings, which played a vital role in its development, RealSee now faces the challenge of generating revenue independently. Furthermore, RealSee must prioritize the delicate balance between short-term commercialization objectives and long-term development strategy to ensure sustainable growth

Study on the MOF Frame Pt-TiO₂ Hybrid Photocatalyst and Its Photocatalytic Performance

As the efficient catalysts are synthesized by a simple strategy, photocatalysis offers a sustainable route to solve the problem of environmentally sound treatment of industrial dye wastewater. Herein, Pt-doped TiO2 with MIL-125 as the backbone has been fabricated using thermal synthesis. The photocatalytic efficiency of the synthesized catalyst samples was tested using Rhodamine B (RhB) as the contaminant model. The physicochemical properties of the solid specimens were characterized using XRD, SEM, TEM, BET and EDX techniques. The photocatalytic degradation experiments showed that the photocatalytic degradation of RhB by M-Pt-TiO2 was 98.97% after 30 min of degradation. The radical capture experiments showed that superoxide radicals and conduction band electrons as reactive oxygen species played a major role in the degradation process. After four cycles, the photocatalytic activity of M-Pt-TiO2 decreased from 98.4% to 94.9%, indicating that the photocatalyst sample had good photocatalytic stability

Photoelectrochemical water splitting under visible light over anti-photocorrosive In2O3-coupling ZnO nanorod arrays photoanode

In2O3 quantum dots with a high crystallinity were deposited on the surface of ZnO nanorods through a chemistry bath method. The resulting In2O3-sensitizing ZnO nanorod arrays not only exhibited enhanced photoelectrochemical activity for water splitting under visible-light irradiation, but also possessed anti-photocorrosion property. The photo-induced charge-transfer property of In2O3 could be improved greatly by coupling with ZnO. This observation demonstrated that the heterojunction at the interface between In2O3 and ZnO could efficiently reduce the recombination of photo-induced electron–hole pairs and increase the lifetime of charge carriers and therefore enhance the photo-to-current efficiency of the In2O3–ZnO nanocrystalline arrays. It reveals that the heterojunction construction between two different semiconductors plays a very important role in determining the dynamic properties of their photo- generated charge carriers and their photo-to-currentconversion efficiency