Interference Cancellation Based Neural Receiver for Superimposed Pilot in Multi-Layer Transmission

In this paper,an interference cancellation based neural receiver for superimposed pilot(SIP)in multi-layer transmission is proposed,where the data and pilot are non-orthogonally superimposed in the same time-frequency resource.Specifically,to deal with the intra-layer and inter-layer interference of SIP under multi-layer transmission,the interference cancellation with superimposed symbol aided channel estimation is leveraged in the neural receiver,accompanied by the pre-design of pilot code-division orthogonal mechanism at transmitter.In addition,to address the complexity issue for inter-vendor collaboration and the generalization problem in practical deployments,respectively,this paper also provides a fixed SIP(F-SIP)design based on constant pilot power ratio and scalable mechanisms for different modulation and coding schemes(MCSs)and transmission layers.Simulation results demonstrate the superiority of the proposed schemes on the performance of block error rate and throughput compared with existing counterparts.

The"4+4"Medical Doctor(MD)Pilot Program at PUMC:Implementation,Performance,and Prospects

Peking Union Medical College(PUMC)launched the"4+4"Medical Doctor(MD)pilot program in 2018,admitting students with non-medical backgrounds from top universities,aligning with national medical talent training policies to foster diverse and eager learners in medicine.On the occasion of the graduation of the first class of the"4+4"MD pilot class at PUMC in 2023,we reviewed the teaching reform in the pilot program and carried out a systematic survey and interviews with students,faculties,and management staff of the pilot class.This article reports on the measures taken by the pilot class at PUMC in enrollment and curriculum setting,and demonstrates the achievements of the pilot class in terms of student academic background structure,knowledge acquisition and skill learning,scientific research ability,and course evaluation.The results indicated that the pilot class had met the national demand for the"Medicine+X"talent training model.More specifically,with a diverse academic backgrounds,the pilot class graduates had academic levels comparable to the eight-year medical education graduates,and their scientific research abilities were satisfactory.The pilot program at PUMC will optimize the curriculum setting,strengthen the construction of faculty,learning resources,and teaching facilities,and reform the academic evaluation methods,thus deepening the reform of medical education and improving the"4+4"MD program as a novel medical education model.

Adverse Pregnancy Outcomes Following Cryotherapy, Thermal Ablation and Loop Electrosurgical Excision Procedure for Cervical Intraepithelial Neoplasia Treatment: A Pilot Study among Zambian Women

Background: Cervical Intraepithelial neoplasia treatments have become essential interventions to manage cervical lesions. Majority of the recipients of these treatments are women within the reproductive age group, who according to literature may be at risk of adverse pregnancy outcomes. This pilot study is part of a study investigating adverse pregnancy outcomes among women who received Cryotherapy, Thermal ablation and Loop Electrosurgical Excision Procedure compared to the untreated women in Zambia. Materials and Methods: This descriptive study analyzed records of 886 (n = 443 treated and n = 443 untreated) women aged 15 - 49 years. The women were either screened with Visual Inspection with Acetic Acid or treated for Cervical Intraepithelial neoplasia at the Adult Infectious Disease Centre between January 2010 and December 2020. Women meeting the criteria were identified using the Visual Inspection with Acetic Acid screening records and telephone interviews to obtain the adverse pregnancy outcome experienced. Data were analysed using STATA version 16 to determine the prevalence and obtain frequency distribution of outcomes of interest. Univariate and multivariable binary logistic regression estimated odds of adverse pregnancy outcomes across the three treatments. Results: The respondents were aged 15 to 49 years. Adverse pregnancy outcomes were observed to be more prevalent in the treatment group (18.5%) compared to the untreated group (5.4%). Normal pregnancy outcomes were lower in the treated (46.3%;n = 443) than the untreated (53.7%;n = 443). The treated group accounted for the majority of abortions (85.2%), prolonged labour (85.7%) and low birth weight (80%), whereas, the untreated accounted for the majority of still births (72.7%). Women treated with cryotherapy (aOR = 2.43, 95% CI = 1.32 - 4.49, p = 0.004), thermal ablation (aOR = 6.37, 95% CI = 0.99 - 41.2, p = 0.052) and Loop Electrosurgical Excision Procedure (aOR = 9.67, 95% CI = 2.17 - 43.1, p = 0.003) had two-, six- and ten-times higher odds of adverse pregnancy outcomes respectively, relative to women who required no treatment. Conclusion: Adverse pregnancy outcomes are prevalent among women who have received treatment in Zambia. The findings indicate that treating Cervical Intraepithelial Neoplasia has been linked to higher chances of experiencing abortion, delivering low birth weight babies and enduring prolonged labor that may result in a caesarean section delivery. Cervical neoplasia treatments, particularly Loop Electrosurgical Excision Procedure, are associated with significantly increased odds of adverse pregnancy outcomes. It is essential to include information about prior Cervical Intraepithelial neoplasia treatment outcomes in obstetric care.

Exploration of Operation and Maintenance Management Mode and Innovation Mechanism of Pilot Base of Chemical Park

Based on the current situation of the operation and maintenance management of the pilot base in many chemical parks in China,this paper conducts an in-depth exploration of the operation and maintenance management and innovation mode of the pilot base from the aspects of the evaluation of the pilot project entering the park,safety and environmental protection supervision,pilot mode,and industrialization mode of the pilot test results,so as to provide solutions for accelerating the process and industrialization of the pilot project and realizing the innovation value of the pilot base.

Optimization of Enzymatic Extraction Process of Polysaccharides from Pseudostellaria heterophylla Fibrous Roots by Response Surface Methodology and Its Pilot Application

[Objectives]To study and optimize the process conditions of enzymatic hydrolysis technology for extracting polysaccharides from Pseudostellaria heterophylla fibrous roots and its application in workshop pilot tests.[Methods]P.heterophylla fibrous roots were taken as the matrix material,and Box Behnken design was used to analyze the extraction time,composite enzyme addition amount,and liquid-solid ratio for response surface optimization experiments,and then applied to the pilot extraction of P.heterophylla fibrous roots.[Results]Response surface analysis showed that all factors had a significant impact on the experimental indicators.The optimal extraction process conditions for polysaccharides from P.heterophylla fibrous roots were extraction time of 2.7 h,compound enzyme addition of 2.5%,and liquid-solid ratio of 32.The yield of polysaccharides from P.heterophylla fibrous roots was 4.83%.The water extraction process of P.heterophylla fibrous roots extraction pilot was used as the control group for response surface optimization of the pilot experiment.The optimization results showed that the extraction time was 3 h,the amount of composite enzyme added was 2.5%,and the liquid-solid ratio was 28.The polysaccharide yield was 4.75%,an increase of 4.63%compared to the control group.[Conclusions]This paper could provide feasibility for the innovation of enzy-matic hydrolysis technology for P.heterophylla fibrous roots and its workshop pilot practice application,as well as a reference for the industrial application of its medicinal resources.

The Tenth Anniversary of Free Trade Pilot Zones in China:Fundamental Experiences and Enhancement Strategies

Since the 18th National Congress of the Communist Party of China,the country has established 21 Free Trade Pilot Zones(FTZs),achieving significant pioneering results in reform and opening up and creating a strong demonstrative effect nationwide.The basic experience from a decade of FTZs includes:adhering to the centralized and unified leadership of the CPC Central Committee;combining top-level design with encouragement of grassroots innovation;leveraging the distinct characteristics and strengths of FTZs to form a differentiated development pattern;maintaining the integration of opening up with domestic reforms;using openness to drive reforms;and organically combining openness with national security assurance.Under the current and future new circumstances,China’s FTZs face new challenges and tasks.In accordance with the directives of the 20th National Congress of the Communist Party of China,an enhancement strategy for the FTZs needs to be implemented.This involves the following:First,accurately understanding and responding to the changing situation to create strategic opportunities.Second,shifting paradigms to implement innovation-driven strategies,using the new development pattern concept to guide the reform experiments and construction of the FTZs.Third,granting more autonomy to FTZs for reforms,pursuing progress while maintaining stability,and solidly advancing the reform experiments in the FTZs.Fourth,orderly expanding the opening up of the service sector and cautiously advancing the internationalization of the renminbi.Fifth,promoting innovative development in trade to build a strong trade nation.Sixth,establishing synergy with bilateral FTZs,Belt and Road cooperation,and national diplomatic strategies to enhance the linkage effect.

Hazardous Attitude Factors Influence Risk Perception in General Aviation Pilots

This manuscript presents a research proposal to investigate how hazardous attitudes among general aviation pilots influence pilot performance in aviation accidents. General aviation pilots train to maintain safe flying conditions, but accidents still occur, and human factors figure prominently among the causes of aviation accidents. The levels of hazardous attitudes among pilots may influence the likelihood of engaging in risky flight behaviors that can lead to accidents. This quantitative study aims to determine whether dangerous attitudes impact risk perception in general aviation pilots. The study will focus on two specific hazardous attitudes, “Anti-Authority” and Macho” behaviors. Among the hazardous attitudes identified by the Federal Aviation Administration (FAA), the two attitudes often stand out in accident investigations and pilot narratives. While all hazardous attitudes have inherent dangers, these two attitudes tend to be more frequently cited in accident reports and investigations. Despite rigorous training in safe flying conditions, general aviation accidents still transpire due to human factors. This research hypothesizes that the five attitudes from the hazardous attitude model, particularly Anti-Authority and Macho, significantly shape pilots’ risk perception. The insights from this study would benefit stakeholders, like the Aircraft Owners and Pilots Association (AOPA), Air Safety Institute, and aviation training programs, in creating training modules tailored to reduce such attitudes.

飞行员校企合作人才培养模式研究

随着中国“十四五”民用航空发展规划的提出,中国航空业引来了飞速发展的时期。但制约民航业发展的一个重要因素是飞行员的短缺,而飞行员短缺的根本原因是培养成本高、培养周期长。本文通过对国内外飞行员培养方式的分析比较,构建飞行员培养成本模型,计算飞行员培养成本,总结国内飞行员校企合作人才培养模式的优势与不足。针对目前飞行员培养环节中存在的多元化需求不足、实践风险问题以及培养过程中高成本问题等,提出相应的对策建议,以期提高飞行员的培养质量,助力中国航空业飞速发展。

国家信息消费试点政策是否促进了城市数字经济发展?——基于2005—2021年中国292个城市面板数据

数字经济的迅猛崛起,已显著提升了其在国民经济结构中的战略地位,成为一股不可或缺的力量,强有力地推动着我国经济向更高质量层次迈进。本文利用2005—2021年中国292个地级市的面板数据,实证研究了国家信息消费试点政策对数字经济发展的影响。结果发现:国家信息消费试点政策对数字经济发展水平具有正向影响;信息化发展水平是国家信息消费试点政策与数字经济发展水平的中介变量;国家信息消费试点政策对数字经济发展的促进作用在特大型城市与大型城市相对更大。基于此,应制定政策鼓励高校和科研机构加大对数字技术人才的培养力度,不断提升国家信息消费试点政策对西部地区数字经济发展水平的促进作用,鼓励试点地区大力发展数字内容、数字娱乐等产业,为客户提供更真实的信息消费体验。

区域创新改革政策如何影响城市碳排放的“减量增质”?——基于全面创新改革试验区的准自然实验

“双碳”目标既是我国对世界的庄重承诺,也是我国创新驱动发展战略的必然举措。稳妥推进“双碳”目标,需立足我国能源资源禀赋,逐步转向碳排放总量和强度“双控”制度,积极参与全球环境治理。论文以全面创新改革试验区城市为准自然实验,基于中国282个地级市2010—2019年面板数据,采用双重差分法检验试验区对城市碳排放“量”与“质”的影响及其作用机制。研究表明,试验区通过提高城市绿色创新能力以及产业集聚效应显著降低城市碳排放水平并提高城市碳生产率,在老工业基地城市以及非资源型城市效果更明显。结论有助于进一步扩大试验区的设立以推动城市碳减排可持续发展,并为碳减排政策提供进一步的决策参考。

自贸试验区设立能否提升地区共同富裕水平——基于宏微观数据的双重验证

新时代推进中国式现代化建设,走共同富裕道路,需全面深化改革与扩大高水平对外开放。自贸试验区作为高水平对外开放体系的基础和平台,对促进共同富裕具有重要意义。基于我国2006—2021年276个地级市面板数据及中国家庭追踪调查数据,通过构建多期双重差分模型,实证检验自贸试验区设立对共同富裕的影响。研究发现,自贸试验区设立显著提升了地区共同富裕水平,且经系列检验后结果依然稳健。异质性分析表明,该政策效应在经济基础较好的地区更显著,且效应随自贸试验区成立批次先增后减。机制检验表明,自贸试验区通过产业、贸易和要素三渠道促进共同富裕。通过从自贸试验区设立的视角探究共同富裕水平提升的路径,能够为地区资源统筹与协调发展、促进共同富裕提供政策启示。

市场型环境规制对碳排放强度的影响效应和机制研究——基于碳交易试点政策的经验证据

作为市场型环境规制手段的碳排放权交易是助力实现“双碳”目标的重要政策。基于2009—2019年中国省级面板数据,运用双重差分法,探究碳交易试点政策的实施对碳强度的影响效应和影响机制。研究发现:碳交易试点政策有效降低了试点地区的碳排放强度,发挥了市场型环境规制的积极作用,而且碳交易机制通过影响能源消费量这一渠道遏制了碳排放强度的增长。通过调节效应模型发现,地区产业结构负向调节碳交易试点政策的降碳效应,而政府规模则正向调节碳交易试点政策的降碳效应。以上结论为进一步推动全国性碳交易市场稳健发展、发挥市场型环境规制的积极作用以及推进“双碳”目标实现提供了重要的经验证据。

新疆边境旅游高质量发展的路径研究

在中国(新疆)自由贸易试验区(以下简称“新疆自贸试验区”)挂牌成立之际,如何充分发挥出新疆自贸试验区的优势,打造西部边境地区旅游高质量发展的示范样板,赋能旅游产业高质量发展,是目前亟待解决的问题。通过系统梳理新疆边境旅游发展基础和面临的主要困难,提出新疆自贸试验区“先行先试”进一步推进新疆边境旅游高质量发展的有关建议。

智慧城市试点政策对城市碳排放强度的影响及机制分析

本文根据2000—2022年从中国218个城市收集的数据,使用多期模型实证分析了智慧城市试点政策对碳强度的影响,并从理论和实证角度分析了智慧城镇建设对城市碳强度的作用和机制,为未来构建更加完善的智慧城市提供经验指导。实证结果证实了试点政策可以有效降低城市地区的二氧化碳排放强度。同时,鼓励产业结构转型和现代化、促进人才库形式的高素质人才流动、采取适当的环境监管措施是试点城市降低碳减排强度的三种有效方法。此外,试点城市的碳减排强度因地理位置、数字基础设施水平和城市规模不同而有所差异。

连续Pilot体制CDMA高速移动台自适应信道估计器

提出了连续Ｐｉｌｏｔ 信号体制ＣＤＭＡ系统中，高速移动台自适应信道估计的方法，它包括信道变化速率的检测和信道估计积分长度的自适应调整两个部分．仿真结果显示，该信道估计器有效拓展了移动台正常工作的运动速度范围，提高了ＲＡＫＥ接收机的适应性．

我国地震巨灾保险试点实践对比研究

地震巨灾保险市场机制在灾害风险防范、损失补偿和恢复重建等方面具有积极作用。该文通过梳理我国2015年以来推广城乡居民地震巨灾保险试点模式和实践情况,总结了全国性、云南和四川的地震巨灾保险方案(全国地震共保体方案),对比了各方案中的保险标的、保险责任、保险金额、赔付标准、保费来源和损失分担等内容。结果表明,除云南采用以震级为触发机制的地震指数保险外,其他地区均基于全国共保体方案调整,探索建立了适用于当地的地震巨灾保险模式。然而,我国地震巨灾保险制度建设目前仍处于发展阶段,面临政策、法规和技术挑战,建议借鉴国际经验,结合国内实践,推动适合中国的地震巨灾保险方案。

产CpxP蛋白枯草芽孢杆菌的发酵优化及中试生产

为获得产CpxP蛋白枯草芽孢杆菌ZY1液体发酵的最佳条件并制备微生态菌剂,采用单因素试验与响应面实验对ZY1进行发酵工艺优化研究。结果表明:摇瓶发酵培养基最佳碳源、氮源、无机盐分别为淀粉、豆粕、NaCl;最优培养基配方为淀粉2.12 g/L、豆粕5.90 g/L、NaCl 5.21 g/L,活菌数达到9.63×10^(8)CFU/mL,比培养基优化前提高了11.04倍;摇瓶发酵条件最佳初始pH值、温度、转速、接种量分别为7.0、37℃、200 r/min、2%,活菌数达1.05×10^(9)CFU/mL,比培养基优化后提高了9.0%;按10%接种量基于5 t发酵罐体系进行菌剂中试生产过程中,ZY1活菌数达到1.05×10^(11)CFU/mL,比摇瓶优化后提高了100倍;发酵结束时芽孢率达到90%,经喷雾干燥制备出菌剂10^(12)kg,成品检测活菌数为8.5×10^(9)CFU/g。研究结果可为进一步开展CpxP蛋白在动物细菌性腹泻病生物防治功能方面的研究提供基础材料。

知识产权助力专精特新企业创新发展——基于专利质押融资试点政策的准自然实验

对于轻资产、重研发的专精特新企业而言,如何开发保护和利用自主知识产权,是企业创新发展道路上需要深入探讨的课题。本文从理论和实证层面考察专利质押融资试点政策对城市专精特新企业创新发展的影响。研究发现:试点政策能够促进城市专精特新企业数量增长和创新质量提高,并在时间维度上呈现“倒U”型发展趋势;创新人才集聚、融资约束缓解和专利质量提升是试点政策推动专精特新企业创新发展的重要渠道;试点政策对城市行政等级较高、城市区位优势较好和民营企业的作用效果更强。因此,应持续推动专利质押融资政策,多渠道发力支撑高质量发展;充分考虑区域发展特征,制定差异化战略;完善知识产权管理体制,持续优化创新和营商环境。

乡村数字基础设施与共同富裕——基于“宽带乡村”试点工程和电信普遍服务试点项目的证据

本文以2008—2021年中国286个地级及以上城市为研究样本,将“宽带乡村”试点工程和电信普遍服务试点项目视为乡村数字基础设施建设的一项准自然实验,通过构建多期双重差分模型,系统考察了乡村数字基础设施建设对共同富裕的影响效应及内在机制。实证研究发现,乡村数字基础设施建设可以缓解数字鸿沟,缩小城乡收入差距,从而促进共同富裕。机制在于,乡村数字基础设施建设通过降低信息获取成本和加强政府数字治理的方式促进共同富裕。拓展研究还发现,乡村数字基础设施建设具备时间累积效应和强外部性的双重特征,运行时间越长对所在地区产生的福利价值越高,而且由于溢出效应对相邻地区也产生了促进作用,对共同富裕目标的实现具有重要贡献。据此,本文提出加强乡村数字基础设施建设,促进数字化赋能共同富裕跨越式发展,加快补齐短板;统筹多方力量,推广数字化教育,深化数字化治理的应用,实现乡村数字基础设施的提档升级;优化数字基础设施的时空布局,构建城乡协同发展网络,推动发展成果共享的政策启示。

数字化转型背景下的教育数据分类分级研究

作为《中华人民共和国数据安全法》规定的数据安全保护基本制度之一,数据分类分级保护制度的实施是数据安全治理和有效利用的基础环节。考虑到教育行业掌握了大量的教育教学业务数据和师生个人信息,故开展教育数据分类分级工作势在必行。为此,文章遵循“现状分析-问题挖掘-方法构建-案例验证”的研究思路,首先梳理了数字化转型背景下教育数据的发展现状和国内外教育数据分类分级的研究现状;接着,文章从制度、管理、技术三个层面深入剖析了教育数据分类分级面临的困境;然后,文章从教育数据分类分级规则和工作流程两个方面,构建了一套教育数据分类分级方法;最后,文章选取3个教育行政部门和6所高校作为试点单位,验证了教育数据分类分级方法的可行性和有效性。教育数据分类分级方法的提出,旨在解决教育行业数据分类分级中缺乏统一标准的问题,可为教育系统各单位开展数据分类分级提供理论指导。