Total Ionizing Dose Response of Different Length Devices in 0.13μm Partially Depleted Silicon-on-Insulator Technology

An anomalous total dose effect that the long length device is more susceptible to total ionizing dose than the short one is observed with the 0.13？μm partially depleted silicon-on-insulator technology. The measured results and 3D technology computer aided design simulations demonstrate that the devices with different channel lengths may exhibit an enhanced reverse short channel effect after radiation. It is ascribed to that the halo or pocket implants introduced in processes results in non-uniform channel doping profiles along the device length and trapped charges in the shallow trench isolation regions.

Extraction Technology of Total Flavonoids from Pueraria lobata (Willd.) Ohwi and Content Determination of Pueraria lobata (Willd.) Ohwi at Different Altitudes

[Objectives]To optimize the extraction technology of total flavonoids from Pueraria lobata( Willd.) Ohwi. [Methods]The ultraviolet-visible spectrophotometry was used to determine the content of total flavonoids in Pueraria lobata( Willd.) Ohwi. With the puerarin as index,the reflux extraction and single factor test were employed to investigate the effects of temperature,time,ethanol concentration and solid-liquid ratio on the content of total flavonoids in Pueraria lobata( Willd.) Ohwi,respectively. Under the optimal extraction technology,the content of total flavonoids in Pueraria lobata( Willd.) Ohwi at different altitudes was determined.[Results] The optimum extraction process was as follows: 70%ethanol; solid-liquid ratio of 1∶ 30; 1 h reflux extraction. Under these conditions,the extraction rate of flavonoids in Pueraria lobata( Willd.) Ohwi was 11. 48%,the total flavonoids content of different kudzu parts was in the order of roots > stems > leaves,and the total flavonoids content of the sample at about an altitude of 1000 m was significantly higher than at the altitudes of 1400 m and 1700 m.[Conclusions]It was suggested that the Pueraria lobata( Willd.) Ohwi should not be cultivated as medicinal plant in too high mountains,and the stems and leaves of Pueraria lobata( Willd.) Ohwi could be used as raw materials for extracting total flavonoids.

Monitoring of coal-mine goaf based on 4D seismic technology

The range of coal-mine underground goaf has continuously expanded over time.Caving,fracture,and deformation zones have also changed,thereby inducing coal-mine water inrush and other environmental disasters.In this study,4 D seismic monitoring technology that is effective in reservoir development was used to monitor abnormal changes in coal-mine underground goaf to explore the feasibility of the method.Taking a coal mine in Hancheng,Shaanxi as an example,we used the aforementioned technology to dynamically monitor the abnormal changes in the goaf.Based on the 4 D seismic data obtained in the experiment and the abnormal change characteristics of the coal-mine goaf,the method of 4 D seismic data processing in reservoir was improved.A set of 4 D data processing flow for the goaf was established,and the anomalies in the surface elevation and overlying strata velocity caused by collapse were corrected.We have made the following improvements to the method of 4 D seismic data processing in the reservoir:(1)the static correction problem caused by the changes of surface elevation and destruction of the low-velocity layer has been solved through fusion static correction to comb the low-frequency components of elevation statics with the high-frequency components of refraction statics;(2)the problem of overlying strata velocity changes in the goaf caused by collapse has been solved through the velocity consistency method;(3)the problem of reflection event pull-down in the disturbance area has been solved through space-varying moveout correction based on cross-correlation;and(4)amplitude anomalies in the coal seam caused by the goaf have been addressed using the correction method of space-varying amplitude.Results show that the 4 D seismic data processing and interpretation method established in this study is reasonable and effective.

A new tracking error detection method using amplitude difference detection for signal waveform modulation multi-level discs

The sub-land/sub-pit affects the characteristic of the tracking error signal which is generated by the conventional differential phase detection （DPD） method in the signal waveform modulation multi-level （SWML） read-only disc. To solve this problem, this paper proposes a new tracking error detection method using amplitude difference. Based on the diffraction theory, the amplitude difference is proportional to the tracking error and is feasible to be used for obtaining the off-track information. The experimental system of the amplitude difference detection method is developed. The experimental results show that the tracking error signal derived from the new method has better performance in uniformity and signal-to-noise ratio than that derived from the conventional DPD method in the SWML read-only disc.

Using Isotope Technology for Surface Water Environment Research in Southern Hanoi

The surface water in the southern of Hanoi capital is researched by identifying δ2H and δ18O stable isotopes together with EC, DO, BOD5, COD, TSS. Surface water samples for studying include the Red river, Nhue river and Kim Nguu river, Thanh Nhan lake, Yen So lake and Van Quan lake were collected in the dry season (April) and the rainy season (August) in 2015. The stable isotope analysis results showed that the δ18O values is a range from -42.53‰ to -64.05‰ and, the δ2H values is the range from -5.09‰ to -8.79‰ under global meteoric waterline (in the water vapor region). The δ2H results of the rivers and lakes in the dry season are more negative than the rainy season with a small difference. The δ18O results of lakes in the dry season are more negative than the rainy season, but the δ18O results of river in the dry season are more positive than the rainy season. The results of the EC, BOD, COD, DO, TSS analysis showed that surface water environment has changed clearly in the two seasons and the contamination level in the dry season is usually higher than the rainy season. The lakes and rivers strongly influenced by human activities led to seriously pollution are Van Quan lake and Yen So lake, Nhue river and Kim Nguu river.

Research into the Assessment of the Intercultural Sensitivity Among University Students of Science and Technology

Globalization makes people from diverse cultural backgrounds communicate effectively. To be a global citizen has become the goal of our education. Landis and Bhagat （1996） argued that intercultural sensitivity is crucial to enable people to live and work with others from different cultural backgrounds. With higher intercultural sensitivity, one will be more global as his understanding of cultural difference becomes more sophisticated. In this present study, the intercultural sensitivity of different majors from a private institute of technology in the north of Taiwan was investigated, using the ISS （Intercultural Sensitivity Scale） developed by Chen and Starosta （2000）. Based on a survey of 358 participants from Nursing Department and Department of Nutrition and Health Sciences, this study focused on five dimensions of the intercultural sensitivity and the participants＇ demographic factors affecting their performance on intercultural sensitivity. The five dimensions included in this study were： （1） interaction engagement, （2） interaction confidence, （3） respect for cultural differences, （4） interaction enjoyment, and （5） interaction attentiveness. Among the five dimensions of intercultural sensitivity, the participants had the highest score on the dimension of ＂respect for the cultural differences＂ and had the lowest score on the dimension of ＂interaction confidence＂. Results generated by stepwise multiple regression indicated ＂decision of studying abroad＂ and ＂experiences of living abroad＂ could effectively predict the participants＇ intercultural sensitivity.

ESG评级是否促进了企业绿色技术创新——来自中国上市公司的微观证据

绿色技术创新是实现碳达峰和碳中和目标的关键驱动力,企业如何利用好ESG提升绿色技术创新水平是当前热门话题。基于商道融绿首次公布上市公司ESG评级事件的准自然实验,以2010—2020年沪深A股上市公司为样本,采用多期双重差分法实证检验ESG评级对企业绿色技术创新的影响。研究结论如下:整体上看,ESG评级事件能显著提升企业绿色技术创新数量和质量,且该结论在平行趋势检验、动态性检验、内生性讨论以及一系列稳健性分析后仍然成立。同时,ESG评级分值越高,企业绿色技术创新水平也越高,但随着ESG评级分值不确定性程度的提高,其对企业绿色技术创新水平的提升作用也有所削弱。通过异质性探究发现,ESG评级更能诱发污染行业和处于成长期、衰退期的企业绿色技术创新水平;位于环境规制较强和市场化程度较高地区的企业,ESG评级对企业绿色技术创新水平影响的边际效应更大。从机制分析结果来看,ESG评级通过降低代理成本、缓解融资约束以及提高管理层环保意识三条途径提升企业绿色技术创新水平。本文拓展了ESG评级经济后果的相关研究,在理论上为第三方评级机构在促进企业绿色技术创新方面的作用提供了新的视角,在实践上为上市公司主动进行ESG评级、投资者利用ESG评级进行决策、政府部门完善ESG评级体系提供了经验依据。

数字中国建设水平测度、地区差异及收敛性研究

文章基于数字基础设施建设、数字技术创新、数字经济、数字社会、数字政府、数字化发展环境、网络安全七个维度,构建数字中国建设水平评价指标体系,对2015—2021年我国30个省份数字中国建设水平进行测度。结果表明:数字中国建设水平表现出递增趋向但总体水平较低,数字技术创新和数字政府建设水平有待进一步提高;东部、中部、西部地区数字中国建设水平具有显著梯度差,呈现“东部高、西部低”的空间分布格局;区域差异分析结果显示,观测期内数字中国建设水平整体差异表现出“U”型特点,差异主要来源于区域间差异;收敛机制分析结果表明,全国及三大地区数字中国建设水平具有绝对β收敛和条件β收敛特征。

知识产权政策对制造业市场竞争力的影响

基于知识产权示范城市政策的准实验,利用2009—2020年中国沪深A股上市制造业企业的数据,结合三重差分模型考察知识产权保护政策对制造行业的企业市场竞争力的作用。研究发现:知识产权示范城市设立对不同制造行业的企业竞争力的影响具有差异性,高技术行业的竞争力相较于传统行业得到进一步提升;对于低股权集中度、国有性质以及大规模等特征的制造业企业,其影响存在差异。进一步分析发现,知识产权示范城市政策能够通过缓解融资约束、影响运营成本以及提高关键技术创新能力推动不同制造行业市场竞争力出现差异性变化。据此提出强化知识产权保护制度建设、完善知识产权服务体系、扶持关键核心技术创新联盟等政策建议。

战略差异度、技术创新与企业全要素生产率——来自A股上市公司的经验证据

战略差异度对企业的影响是学术界关注的重要问题,而企业能否通过加大战略差异度进而提升全要素生产率为研究企业战略决策方面提供了不同的切入点。采用2009-2020年沪深A股上市公司的数据样本,实证检验了战略差异度对企业全要素生产率的影响。研究结果表明,战略差异度对企业全要素生产率起到显著的正向作用,技术创新在战略差异度影响企业全要素生产率的传导路径上存在中介效应。进一步研究发现,高行业竞争水平、高信息透明度和低融资约束企业的战略差异度越大对全要素生产率的正向作用越显著。研究丰富了全要素生产率的相关文献,并为其提供了研究的新视角。同时有助于企业利益相关者理解战略决策的经济后果,对指导和促进企业进行战略变革及获取竞争优势提供理论参考。

数字经济、绿色技术创新与能源效率提升——基于城市面板数据的实证分析

提高能源效率是我国经济绿色转型和实现双碳目标的必然要求,当下数字经济已成为能源效率提升的新动能。本文基于数字经济的“四化”框架,在理论分析的基础上,运用2011~2020年我国284个地级市的面板数据,实证检验了数字经济影响能源效率提升的机制、特征和路径。结果表明:(1)数字经济及各维度对能源效率提升的总体效应为正,其中产业数字化促进作用最强,且数字经济对能源效率的提升具有区域异质性;(2)数字经济对能源效率的提升存在双门槛,呈现中间波动但总体促进的“N”型特征;(3)数字经济可通过促进绿色技术创新进而提升能源效率,且绿色技术创新水平的提高有助于城市跨越数字经济的第二个门槛,实现数字经济发展与能源效率提升的共赢。

中国省域环境规制与科技创新耦合协调发展研究

环境规制与科技创新耦合协调发展能为实现经济增长与生态文明提供强有力的支撑。该文构建环境规制与科技创新水平评价指标体系,利用耦合协调度模型测算2009—2020年中国30个省域环境规制与科技创新的耦合协调度,并对耦合协调度的时空分布格局进行分析。结果表明:研究期内中国30个省域环境规制与科技创新的耦合协调度整体偏低,尚未达到良性耦合协调发展状态,但呈现上升趋势,增幅呈现“西高东低”特征;各地区耦合协调度发展不均衡,整体呈现“东高西低、南高北低”的空间分布格局,高水平耦合协调区域逐渐从东部沿海向内陆扩张;依据协调等级和特征将各省域划分为创新主动型、技术进步型、环境约束型、传统被动型和创新滞后型,并提出环境规制应结合地区创新能力实施差异化的区域政策等建议。

低碳城市试点政策能否有效促进可再生能源技术创新?

低碳城市试点政策是中国促进经济社会绿色低碳发展的一项重要举措,而可再生能源技术创新是其中的关键技术路径。基于2006—2020年的城市数据,采用渐进双重差分法考察低碳试点城市对可再生能源技术创新发展的作用机制与影响差异。结果显示,低碳城市试点政策主要通过影响城市产业结构和绿色金融发展促进可再生能源技术创新发展,且对不同资源禀赋城市的可再生能源技术创新具有异质性影响。研究建议持续扩大低碳城市试点政策推行范围,促进可再生能源技术创新发展,从而推动社会绿色转型。

eVTOL飞行器冗余捷联惯性导航信息融合研究

电动垂直起降(eVTOL)飞行器的运用,作为一种未来城市交通的潜在解决方案,具有缓解城市交通拥堵和提高空中交通效率的巨大潜力。在其常用的导航系统中,通常采用组合导航和传感器余度技术来提高系统可靠性与安全性。然而,在当前导航系统的传感器余度技术中,冗余传感器只起到备份数据的作用,导致测量数据的信息利用率不高。为解决这一问题,文中以三余度的捷联惯性导航系统(SINS)和全球导航卫星系统(GNSS)的组合导航系统为研究对象,提出了一种基于二阶互差分和惯性传感器(IMU)冗余信息的陀螺仪噪声实时估计方法,推导了在二余度和三余度情况下陀螺仪噪声估计的递推式;在获得陀螺仪的噪声估计值后,采用自适应扩展卡尔曼滤波方法将SINS和GNSS的导航信息进行融合,以提高组合导航系统的准确性和鲁棒性。通过对SINS/GNSS组合导航系统进行仿真和真实跑车实验,结果表明:文中方法能够准确估计陀螺仪噪声;相较于传统融合方法,引入陀螺仪噪声实时估计后,组合导航系统的导航精度和抗干扰能力得到了提高,具有实际的工程意义。

网络基础设施建设对包容性绿色增长的影响——基于“宽带中国”战略的准自然实验

推动包容性绿色增长是解决我国低碳发展目标与经济增长矛盾的重要途径。本文基于2010~2022年我国地级市层面数据,利用熵权TOPSIS法从多个维度测算了289个地级市的包容性绿色增长水平,采用多期双重差分模型探究网络基础设施建设对包容性绿色增长的影响及传导机制。研究结果表明:(1)网络基础设施建设能够有效促进包容性绿色增长水平的提升;(2)网络基础设施建设对于非资源型城市包容性绿色增长效应显著高于资源型城市;(3)网络基础设施建设能够通过提高制造业集聚水平、促进产业结构升级、鼓励技术创新进一步提升包容性绿色增长水平。本文在进一步完善包容性绿色增长的现有分析框架基础上,为政府推进“宽带中国”战略实施、缩小区域发展差距以及促进经济高质量发展提供政策启示。

绿色技术创新政策对西部地区经济高质量发展的影响和作用机制研究

“双碳”目标下科学评估绿色技术创新政策对西部地区经济高质量发展的影响十分必要。本文遵循新发展理念,构建了经济高质量发展综合评价指标体系,对2013一2022年西部地区经济高质量发展指数进行测算;在此基础上,将绿色技术创新政策视为政策性准自然实验,运用双重差分法实证检验绿色技术创新政策对西部地区经济高质量发展的影响和作用机制,并通过平行趋势检验和稳健性检验对模型的稳健性进行了验证;最后针对绿色技术创新政策对西部地区经济高质量发展的作用机制进行深入探讨。研究结论如下:(1)西部地区的经济高质量发展水平稳步提升。从五个维度来看,创新、协调、绿色和共享增长较快,开放增长较为平缓。(2)绿色技术创新政策的实施促进了西部地区的经济高质量发展。其中,绿色技术创新政策对创新、协调、绿色和共享具有显著的促进作用。(3)绿色技术创新政策在直接促进经济高质量发展的同时,也通过促进优化产业结构、能源结构和固定资产投资结构推动西部地区经济高质量发展。本文为评估绿色技术创新政策对西部地区经济高质量发展影响提材料支撑的同时,也对促进西部地区绿色转型和可持续发展提出了相应的政策建议。

低碳试点城市、企业数字化转型和绿色技术创新

低碳和数字化发展是当前中国绿色技术创新面临的两大重要机遇,但现有研究仍缺乏对低碳试点城市政策、企业数字化转型和绿色技术创新三者关系进行系统讨论。因此本文基于新古典经济学理论和波特假说,收集2007—2019年中国制造、化工等工业部门及综合性中大型A股上市公司共9370个样本数据,构建双重差分模型来验证低碳试点城市政策、企业数字化转型和绿色技术创新三者关系。结果表明低碳试点城市政策可以显著促进绿色技术创新,企业数字化转型是重要机制。同时,低碳试点城市政策对绿色技术创新的影响及企业数字化转型的机制效应因不同的绿色技术类型、企业性质和所处的地理位置具有不同的异质性特征。研究为中国低碳试点城市政策、企业数字化转型和绿色技术创新三者关系的讨论提供理论解释,同时也为实现“双碳”目标提供政策参考。

低碳试点政策对城市碳中和技术创新的影响及溢出效应

低碳试点政策是促进城市碳中和技术创新的重要工具,以2009-2021年中国266个城市面板数据为样本,利用多种双重差分模型,实证分析低碳试点政策对碳中和技术创新的影响及空间溢出效应。结果表明:第一,低碳试点政策促进试点城市碳中和技术创新,且对零碳与低碳技术创新的影响更显著;低碳试点政策的影响效应具有异质性,在高行政等级、大规模人口、低资源依赖、高数字化水平和高环境规制城市表现更显著。第二,低碳试点政策通过强化政府管制、完善市场制度和加强社会监督促进碳中和技术创新,其中,政府管制的传导作用最显著,其次是市场制度,而社会监督的作用最弱。第三,低碳试点政策具有明显的正向空间溢出效应,来自邻近地区的间接效应占比高达77%,且产业结构优化会增强低碳试点政策的溢出效应。

区域技术创新与数字贸易耦合协同发展研究

基于2013—2021年中国31个省(区、市)面板数据,运用熵值法和耦合协调度模型测算中国31个省(区、市)区域技术创新和数字贸易发展评价指标体系及二者的时空耦合协调特征。研究发现:a) 2013—2021年中国31个省(区、市)区域技术创新水平和数字贸易发展均呈上升趋势,但东部、西部、中部、东北部地区仍呈现出不同程度的差距。b)区域技术创新与数字贸易耦合协调度持续增强,耦合协调度等级都有不同程度的提升,但耦合协调度差异较大,整体呈“东南强,西北弱”的空间分布格局。c)区域技术创新与数字贸易耦合协调局部空间效应较为显著,从东南至西北地区呈现明显的梯度分异,“高—高”集聚、“高—低”集聚以及“低—高”集聚主要分布于长江上中游经济区与东南沿海经济区,“低—低”集聚分布于青藏高原和西北边疆地区。针对耦合协调现状,提出制定因地制宜的区域协调发展政策、加强区域协同、提高发达地区的辐射效应、培育“极化区域”等政策建议。