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Pulsatile gonadotropin-releasing hormone therapy induces spermatogenesis in pituitary stalk interruption syndrome:A case report and review of the literature

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World Journal of Clinical Cases 2024年第20期12卷 4348-4356页

作者： Jin-Long Xie Hai-Ying Zhu Yang Dong ping-ping sun Dan-Dan Qi Su-Xian Luan Yan Zhang Hua-Gang Ma The Reproductive Medicine Centre Weifang People's HospitalWeifang 261000Shandong ProvinceChina Department of Radiology Weifang People's HospitalWeifang 261000Shandong ProvinceChina

BACKGROUND Pituitary stalk interruption syndrome(PSIS)is a rare anatomical defect of the pituitary gland falling under the spectrum of holoprosencephaly *** is characterized by a deficiency in anterior pituitary hormones,such as growth hormone,gonadotropins,and thyroid *** to the syndrome's rarity and nonspecific manifestations,there is a lack of standardized treatment ***,early diagnosis through imaging and on-time intervention are crucial for improving patients’*** SUMMARY A 30-year-old man presented with absent secondary sexual characteristics and *** evaluation revealed a deficiency in gonadotropins,while thyroid function was mostly within normal *** resonance imaging of the pituitary gland showed pituitary stalk agenesis,hypoplasia of the anterior pituitary,and ectopic posterior pituitary,leading to the diagnosis of ***,the patient underwent 6 mo of gonadotropin therapy without significant changes in hormone levels and secondary sexual *** gonadotropin-releasing hormone therapy was then administered,resulting in the detection of sperm in the semen analysis within 3 *** 6 mo,routine semen tests showed normal semen *** couple faced challenges in conceiving due to abstinence and underwent three cycles of artificial insemination,which was *** also attempted in vitro fertilization,but unfortunately,the woman experienced a miscarriage 10 wk after the embryo *** Early detection,accurate diagnosis,and timely treatment are crucial in improving the quality of life and fertility of PSIS patients.

关键词： Pituitary stalk interruption syndrome Hypogonadotropic hypogonadism Spermatogenesis Pulsatile gonadotropinreleasing hormone therapy Case report

Accelerating leaching of copper ore with surfactant and the analysis of reaction kinetics

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International Journal of Minerals,Metallurgy and Materials 2019年第3期26卷 274-281页

作者： Chun-ming Ai ping-ping sun Ai-xiang Wu Xun Chen Chao Liu College of Safety Science and Engineering Liaoning Technical University Key Laboratory of Ministry of Education of China for Efficient Mining and Safety of Metal Mines University of Science and Technology Beijing Wanbao Mining Limited

To solve the problem of low permeability and lower extraction rates of high-mud ores, a surfactant was added as a penetrant to the pregnant leaching solution during column leaching tests. On the basis of the theories of physical chemistry and seepage flow mechanics, the mechanism by which seepage is enhanced under the effects of the surfactant was analyzed. The results show that the action modes of the surfactant were divided into four aspects: changing the wettability of the ore, reducing the viscosity of the leaching solution, adsorbing onto the surface of ore, and enhancing the permeability effect. The findings of column leaching tests demonstrated that permeability was substantially improved by the surfactant. In the later period of leaching, the permeability coefficient was two times higher than that of the control group. Meanwhile, the ore extraction rate increased by approximately 10%. During the leaching process, the surface tension of the solution did not substantially change, and that of the solution with surfactant increased slightly. The kinetics analysis of ore column leaching illustrated that the leaching processes were controlled by both internal diffusion(principal factor) and chemical reaction.

关键词： surfactant permeability reaction kinetics leaching

A new carbon phase with direct bandgap and high carrier mobility as electron transport material for perovskite solar cells

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npj Computational Materials 2019年第1期5卷 1063-1069页

作者： ping-ping sun Lichun Bai Devesh R.Kripalani Kun Zhou School of Mechanical and Aerospace Engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore SMRT-NTU Smart Urban Rail Corporate Laboratory Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore

Rapid development of perovskite solar cells is challenged by the fact that current semiconductors hardly act as efficient electron transport materials that can feature both high electron mobility and a well-matched energy level to that of the *** we show that T-carbon,a newly emerging carbon allotrope,could be an ideal candidate to meet this *** using first-principles calculations and deformation potential theory,it is found that T-carbon is a semiconductor with a direct bandgap of 2.273 eV,and the energy level in the conduction band is lower than that of perovskite by 0.5 eV,showing a larger force of electron ***,the calculated electron mobility can reach up to 2.36×10^(3) cm^(2) s^(–1) V^(–1),superior to conventional electron transport materials such as TiO2,ZnO and SnO2,which will facilitate more efficient electron separation and more rapid diffusion away from their locus of generation within the perovskite ***,the bandgap of T-carbon is highly sensitive to strain,thus providing a convenient method to tune the carrier transport ***,T-carbon satisfies the requirements for a potential efficient electron transport material and could therefore be capable of accelerating the development of perovskite solar cells.

关键词： perovskite absorber satis

Strong Subgame Consistency of the Core in Stochastic Network Formation Games

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Journal of the Operations Research Society of China 2024年第1期12卷 189-213页

作者： ping sun Elena Parilina Faculty of Applied Mathematics and Control Processes Saint Petersburg State UniversitySaint Petersburg199034Russia

We consider a model of network formation as a stochastic game with random duration proposed initially in sun and Parilina(Autom Remote Control 82(6):1065–1082,2021).In the model,the leader first suggests a joint project to other players,i.e.,the network connecting ***,the players are allowed to form fresh links with each other updating the initially proposed *** stage payoff of any player is defined depending on the network *** are two types of randomness in the network formation process:(i)links may fail to be formed with different probabilities although players intend to establish them,(ii)the game process may terminate at any stage or transit to the next stage with a certain probability ***,a network is formed as a result of players’decisions and realization of random *** cooperative version of the stochastic game is *** particular,we examine the properties of subgame consistency as well as strong subgame consistency of the *** provide a payment mechanism or regularization of the core elements to sustain its subgame consistency and avoid the player’s deviations from the cooperative *** addition,the distribution procedure of the core elements is regularized in case there are negative payments to achieve only nonnegative payments to the players at any *** sufficient condition of a strongly subgame consistent core is also *** illustrate our theoretical results with a numerical example.

关键词： Stochastic game Network formation Core Strong subgame consistency

High-precision analytical solutions for Earth coverage of constellation equipped with reentry glide vehicles

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Chinese Journal of Aeronautics 2024年第9期37卷 385-398页

作者： ping MA Weibo sun Jie GAO Tao CHAO Control and Simulation Center Harbin Institute of TechnologyHarbin 150001China Beijing Institute of Spacecraft System Engineering Beijing 100094China

To efficiently and accurately design satellite constellations equipped with Reentry Glide Vehicles(RGVs),new analytical solutions are developed for calculating their coverage ***,a new coverage model is established by approximating the Reentry Reachable Domain(RRD).However,the computation of real-time relative distances between satellites and targets,which is essential for coverage analysis based on this model,imposes a significant compu-tational *** address this challenge,a coverage analysis method based on two-dimensional map theory is *** method represents the coverage conditions of a target as a fixed area on a two-dimensional map and transforms the satellite trajectory into a series of parallel *** determining the intersection points between these lines and the area boundaries,the coverage ana-lytical solutions for a target point are *** this basis,coverage theorems are presented for rapid calculation of the constellation coverage performance for an *** results demon-strate the effectiveness and high precision of the proposed analytical solutions.

关键词： Constellation Analytical solutions Reentry glide vehicle Reentry reachable domain Two-dimensional map

Microplastic pollution in Yellow River,China:Current status and research progress of biotoxicological effects

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China Geology 2021年第4期4卷 585-592页

作者： Rui-ping Liu Zhi-zhong Li Fei Liu Ying Dong Jian-gang Jiao ping-ping sun El-Wardany RM Xi’an Center China Geological SurveyMinistry of Natural ResourcesXi’an 710054China Western Green Development Research Institute ChinaGeological SurveyXi’an 710054China Key Laboratory for Geo-hazards in Loess area Ministry of Natural ResourcesXi’an 710054China Field Base of Scientific Observation of Shannxi Tongguan Ministry of Natural ResourcesXi’an 710054China Dalian Ocean and Fishery Comprehensive Administration Enforcement Team Dalian 116000China School of Earth Science and Land Resources of Chang’an University Xi’an 710054China Al-Azhar University Assiut 71524Egypt

This study aims to comprehensively assess the environmental risks of microplastics in the Yellow River,achieving the following results through comprehensive *** average microplastic abundances in the river waters and sediments are 5358-654000 n/m3 and 43.57-615 items/kg,respectively,and there are fewer microplastics in water samples than in *** in the study area can be divided into five types according to their occurrence morphologies,namely fragments,foams,films,fibers,and *** most widely distributed pollution types in sediments include debris,fibers,and *** contrast,fibers are the dominant type in water samples,accounting for 68.18%‒98.93%.The chemical components of the microplastics include polyethylene,polypropylene,polystyrene,polyethylene terephthalate,and polyvinyl *** microplastics are in four colors,with white accounting for a higher *** grain size of the microplastics in tributaries or lakes of the Yellow River is less than 2 mm,which makes them liable to enter organisms for ***,the sources of the microplastics are closely related to agricultural and industrial production and biological activities in habitats and exhibit seasonal and hydrological *** microplastics in the study area show the adsorption of metals and nonmetals to different degrees,which increases the pollution risks of heavy metals combined with *** addition,microplastics can accumulate in organisms in the Yellow River and cause physical,biochemical,and other damage to aquatic organisms,thus further posing carcinogenic risks to human ***,it is necessary to study,monitor,and control the pollution and effects of microplastics in the Yellow River,in order to provide theoretical references for the control of pollution and ecological risk of microplastics in the river.

关键词： Microplastic pollution Influence factor Biotoxicological effects Hydrogeological engineering Ecological engineering Yellow River China

Evaluation of urban underground space resources using a negative list method: Taking Xi'an City as an example in China

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China Geology 2020年第1期3卷 124-136页

作者： Mao-sheng Zhang Hua-qi Wang Ying Dong Lin Li ping-ping sun Ge Zhang Shaanxi Province Engineering Research Centre of Water Resources and Environment Xi'an Center of China Geological SurveyMinistry of Natural ResourcesXi'an 710054China

Utilization of urban underground space has become a vital approach to alleviate the strain on urban land resources,and to optimize the structure and pattem of the *** is also very important to improve the city environment,build livable city and increase the capacity of the *** on the analysis of existing evaluation methods and their problems,a method for evaluating underground space resources based on a negative list of adverse factors affecting underground space development is proposed,to be primarily used in urban planning stages.A list of the adverse factors is established,including limiting factors,constraining factors and influencing *** Xi'an as an example,using a geographical information system platform,a negative list of adverse factors for the underground space resources in Xi'an City are evaluated,and preventive measures are *** resources,exploitable resources,and the potential growth of exploitable underground space resources are *** space assessment in the different development stages of the city,collaborative utilization and safety evaluation for multiple subsurface resources,environmental impact and assessment,as well as evaluation methods based on big data and intelligent optimization algorithms are all discussed with the aim of serving city planning and construction.

关键词： Urban geology Negative list Natural resources for underground space Exploitable resources for underground space 3D geological structure model GIS platform Urban geological survey engineering Xi'an City Shaanxi Province China

Reproductive biology of Hemitripterus villosus in the Bohai Strait,China

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Journal of Oceanology and Limnology 2024年第3期42卷 881-892页

作者： ping sun Song QIN Zhengyi LIU Longchuan ZHUANG Key Laboratory of Coastal Biology and Biological Resource Utilization Yantai Institute of Coastal Zone ResearchChinese Academy of SciencesYantai 264003China University of Chinese Academy of Sciences Beijing 100049China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China

To understand the reproductive biology of Hemitripterus villosus in the Bohai Strait,and fill the key knowledge gap in verifying reproductive seasonality and documenting gonadotropin dependent reproductive cycle of this species,a year-round detail study was conducted for the first *** total,263 individuals were randomly sampled off the coasts of the Bohai *** show that and the overall female-to-male ratio(1.35:1)did not differ significantly from the 1:1 sex *** length and weight relationship for females and males were regressed,depicting an isometric growth for both *** reproductive phases of the complete gonadotropin dependent reproductive cycle in both sexes were *** monthly variations in the gonadosomatic and hepatosomatic indexes for both sexes further indicated that this species spawns a single batch of eggs per year and the peak spawning period is from October to *** average diameter of eggs ranged from 2.10 to 3.57 *** length at first sexual maturity was 224.87 mm for females and 241.26 mm for *** positive relationships between absolute fecundity and fish size,and also gonadal weight were *** from the Bohai Strait exhibited smaller body size,smaller egg diameter,lower gonadosomatic index,lower absolute fecundity,and higher population extinction risk than the other populations’studied *** findings contribute to understanding the status of this isolated westernmost population,and we emphasize that more efficient protection measures for the species and control measures are urgently required to improve the coastal environment in the Bohai Strait.

关键词： Hemitripterus villosus Bohai Strait fecundity length at first maturity reproductive seasonality

Study of inter-well interference in shale gas reservoirs by a robust production data analysis method based on deconvolution

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Petroleum Science 2024年第4期21卷 2502-2519页

作者： Wen-Chao Liu Cheng-Cheng Qiao ping Wang Wen-Song Huang Xiang-Wen Kong Yu-ping sun He-Dong sun Yue-Peng Jia School of Civil and Resource Engineering University of Science and Technology Beijing PetroChina Research Institute of Petroleum Exploration and Development

In order to overcome the defects that the analysis of multi-well typical curves of shale gas reservoirs is rarely applied to engineering, this study proposes a robust production data analysis method based on deconvolution, which is used for multi-well inter-well interference research. In this study, a multi-well conceptual trilinear seepage model for multi-stage fractured horizontal wells was established, and its Laplace solutions under two different outer boundary conditions were obtained. Then, an improved pressure deconvolution algorithm was used to normalize the scattered production data. Furthermore, the typical curve fitting was carried out using the production data and the seepage model solution. Finally,some reservoir parameters and fracturing parameters were interpreted, and the intensity of inter-well interference was compared. The effectiveness of the method was verified by analyzing the production dynamic data of six shale gas wells in Duvernay area. The results showed that the fitting effect of typical curves was greatly improved due to the mutual restriction between deconvolution calculation parameter debugging and seepage model parameter debugging. Besides, by using the morphological characteristics of the log-log typical curves and the time corresponding to the intersection point of the log-log typical curves of two models under different outer boundary conditions, the strength of the interference between wells on the same well platform was well judged. This work can provide a reference for the optimization of well spacing and hydraulic fracturing measures for shale gas wells.

关键词： Shale gas Inter-well interference Deconvolution Production data analysis Typical curves Multi-stage fractured horizontal well