Crystallization management of CsPbI_(2)Br perovskites by PbAc_(2)-incorporated twice spin-coating process for efficient and stable CsPbI_(2)Br perovskite solar cells

CsPbI_(2)Br perovskite solar cell has been extensively studied due to its exceptional thermal stability and relatively stable perovskite phase structure.However,the presence of bromine leads to a rapid crystallization rate of CsPbI_(2)Br films,resulting in small grain size and high defect density.Additionally,CsPbI_(2)Br demonstrates poor light absorption due to its wide bandgap.Therefore,it is crucial to control the crystallization rate and increase the film thickness to reduce defect density,enhance light absorption,and improve photovoltaic performance.In this study,we utilized a PbAc_(2)-incorporated twice spincoating(PTS) process to address these issues.Initially,PbAc_(2) was added to the CsPbI_(2)Br precursor solution to form a CsPbI_(2)Br film,which was then coated with the CsPbI_(2)Br precursor solution to produce the PTS film,Ac^(-)can delay the perovskite crystallization,leading to the formation of thicker and denser CsPbI_(2)Br films.Moreover,lone-pair electrons of the oxygen atom provided by Ac^(-)formed coordination bonds with under-coordinated Pb~(2+) ions to fill halogen ion vacancies,thereby reducing the defect density.Ultimately,the PTS CsPbI_(2)Br device achieved a peak power conversion efficiency(PCE) of 16.19% and maintained 96.7% of its initial PCE over 1500 h at room temperature under 25% relative humidity without any encapsulation.

Obtainment of Transgenic Tobacco Harboring phbA , phbB and phbC Genes by Twice Transformation

To avoid the long time required for conventional sexual crossing, transgenic tobacco (Nicotiana tabacum L.) plants harboring phbA gene (encoding 3_ketothiolase) were used as the target plant for the second transformation mediated by Agrobacterium tumefaciens (Smith et Townsend) Conn LBA4404 containing pZCB which was constructed by linking phbB (encoding acetoacetyl_CoA reductase), phbC (encoding PHB synthase) and ctp sequence to pBIB_HYG under the control of CaMV 35S promoter. The hygromycin resistant transformants were morphologically normal and stable integration of phbB and phbC was confirmed by PCR and PCR_Southern. Moreover, RT_PCR_DNA hybridization analysis showed that 6.67% of the transformed tobacco plants could express both phbB and phbC at transcriptional level.

Additive Benefits of Twice Forest Bathing Trips in Elderly Patients with Chronic Heart Failure

Chronic heart failure （CHF）, a clinical syndrome resulting from the consequences of various cardiovascular diseases （CVDs）, is increasingly becoming a global cause of morbidity and mortality. We had earlier demonstrated that a 4-day forest bathing trip can provide an adjunctive therapeutic influence on patients with CHF. To further investigate the duration of the impact and the optimal frequency of forest bathing trips in patients with CHF, we recruited those subjects who had experienced the first forest bathing trip again after 4 weeks and randomly categorized them into two groups, namely, the urban control group （city） and the forest bathing group （forest）. After a second 4-day forest bathing trip, we observed a steady decline in the brain natriuretic peptide levels, a biomarker of heart failure, and an attenuated inflammatory response as well as oxidative stress. Thus, this exploratory study demonstrated the additive benefits of twice forest bathing trips in elderly patients with CHF, which could further pave the way for analyzing the effects of such interventions in CVDs.

A novel twice-interpolation finite element method for solid mechanics problems

Formulation and numerical evaluation of a novel twice-interpolation finite element method （TFEM） is presented for solid mechanics problems. In this method, the trial function for Galerkin weak form is constructed through two stages of consecutive interpolation. The primary interpolation follows exactly the same procedure of standard FEM and is further reproduced according to both nodal values and averaged nodal gradients obtained from primary interpolation. The trial functions thus constructed have continuous nodal gradients and contain higher order polynomial without increasing total freedoms. Several benchmark examples and a real dam problem are used to examine the TFEM in terms of accuracy and convergence. Compared with standard FEM, TFEM can achieve significantly better accuracy and higher convergence rate, and the continuous nodal stress can be obtained without any smoothing operation. It is also found that TFEM is insensitive to the quality of the elemental mesh. In addition, the present TFEM can treat the incompressible material without any modification.

A Case of Harvesting Anterolateral Thigh Flaps Twice from the Ipsilateral Thigh of a Single Patient in Separate Operations

Until now, harvesting of flap elevations from the ipsilateral thigh twice in the same patient in two operations has not been reported. We harvested thigh flaps twice from the ipsilateral thigh of a single patient in separate operations. A 44-year-old man had skin defects of the right thumb and the left middle finger. In the first operation, his right thumb was reconstructed by the hemi-pulp flap. The anterolateral thigh flap harvested from the left thigh transferred to the donor site defect of the hemi-pulp flap. Sixteen days after the first operation, another anterolateral thigh flap harvested from the left thigh transferred to the defect of the left middle finger. This operative procedure is very useful for cases requiring multi-flap transfer.

Effective interventions to improve domain-specific social, emotional, or academic outcomes for twice-exceptional individuals who are gifted with ADHD as a disability

The demand for effective interventions to improve domain-specific academic outcomes for individuals with special needs at either end of the spectrum has existed for some time.Since the earlier contributions to the literature documenting gifted individuals who were simultaneously exhibiting disabilities,there has been some progress in our understanding.We now know that in individuals with both gifts and disabilities,potentially,either or both of the exceptionalities can obscure the effects of the other,which significantly delays the average time to receive a diagnosis.Such delays in diagnosis detrimentally impact the the form of effective interventions without a diagnosis.The purpose of this paper is t quality of life across various domains because there can be no opportunity to receive help in o determine whether effective interventions exist to improve domain-specific(i.e.,social,emotional,or academic)outcomes for people with both gifts and disabilities.A query was performed using evidence databases TRIP and PDQ for“twice-exceptional,”“Giftedness,”“Disability,”and“intervention.”The four most relevant,freely available studies in English were selected for critique.Despite identifying potential threats to validity among the studies,methodological similarities among them were strong enough to confidently conclude that not only do effective interventions exist for the population of gifted with ADHD,but the outcomes of these interventions may also carry over into other domains resulting in indirect effects.

LV/HV兼容Twice-Well CMOS芯片与制程结构

LV/HV兼容Twice-Well CMOS技术,该技术能够实现低压5 V与高压100 V^700 V(或更高)兼容CMOS工艺。为了便于高低压MOS器件兼容集成,采用比通常浅双阱更深的阱,形成其漂移区的偏置栅结构的HV MOS器件。采用MOS芯片结构设计、工艺与制造技术,依该技术得到了芯片制程结构。

Tacrolimus once daily (Advagraf) vs twice daily (Prograf) in De Novo renal transplantation:a multicentre,randomized,open label,parallel control phase Ⅲ study

Objective To compare the efficacy and safety of twice - daily tacrolimus ( Tacrolimus BID; Prograf) vs once - daily prolonged release tacrolimus ( Tacrolimus QD; Advagraf) ,combined with steroids and mycophe-nolate mofetil in preventing acute rejection in De

与北美、西欧、日韩同场竞技 中国消费电子展示实力——访RBI锐德国际资讯集团新型国家执行副总裁Luke Rattigan与《TWICE CHINA消费电子商讯》出版人朱东方

日前,《TWICE CHINA消费电子商讯》宣布,为了帮助中国消费电子企业成功把握后奥运商机,提升品牌国际化形象,为布局全球提供动力,'2008-2009中国消费电子产业领先品牌TOP10'、'全球消费电子50强(全球CE50)'活动正在全面展开,国内众多知名厂商如海尔、海信、TCL、康佳、长城、德赛、长虹、同方。

基于二次分解集成的机场流量短期预测

为实现准确的机场流量短期预测,本文建立了基于二次分解方法的分解集成预测模型。首先,应用局部加权回归周期趋势分解(STL,seasonal and trend decomposition procedure based on Loess)算法将原始时间序列分解为趋势项、季节项和余项3个分量,并计算其样本熵。其次,应用遗传算法(GA,genetic algorithm)优化变分模态分解(VMD,variational mode decomposition)参数,对熵值较大的分量进行二次分解。再次,使用极端梯度提升(XGBoost,extreme gradient boosting)对二次分解后的所有分量进行预测,采用加和集成得到最终的预测值。最后,采集国内典型机场实际运行数据进行实例分析。针对北京首都国际机场60 min进场、离场流量时序,本文模型预测的均等系数(EC,equal coefficient)值分别为0.9703、0.9959,相比其他常用模型均有所提高。此外,对于上海浦东、上海虹桥、广州白云3个大型国际机场,本文模型在60 min、30 min统计尺度下进场和离场流量预测的EC值均在0.9700以上,15 min统计尺度下预测的EC值均在0.9500以上。结果表明,本文建立的二次分解集成预测模型具有良好的准确性和普适性,用于机场流量短期预测是可行和有效的。

三选于吏部卒无成:韩愈三应博学宏词科考辨

韩愈自云“三选于吏部卒无成”,是指他曾三次参加博学宏词科考试,但均以落选告终。对此“三选”的详情,诸家所说不一,以致对韩愈相关生平和作品的系年混乱。结合唐代举选制度和韩愈进士及第于贞元八年春的生平履历,结合同期应试的李观作品《中和节诏赐公卿尺诗》,可知韩愈第一次参选博学宏词科冬集于贞元八年冬,考试在贞元九年春;从韩愈的《与崔立之书》和《上考宏词崔虞部书》的有关表述,结合洪兴祖《韩子年谱》考证此次试题《太清宫观紫极舞赋》的背景和具体内容,推断韩愈第二次参选宏词科冬集于贞元九年冬,考试也在贞元九年冬,著名的《颜子不贰过论》便为此次应试之作;从《祭兄子十二郎老成文》《上宰相书》的内容和创作时间,结合试题之一的《冬日可爱诗》内容和韩愈《省试学生代斋郎议》的旧注,推断韩愈第三次参选宏词科冬集于贞元十年冬,考试也在贞元十年冬。

基于动态时间规整的气温日值数据二次插补

气温作为研究气候演变最基础的物理量,其日值序列的完整性和准确性对于气候分析与评估工作有着重要意义。近些年随着大量无人值守地面加密自动气象站的布设,不断出现随机站点和随机长度这种双随机特点的气象资料序列缺失,给气候分析和业务应用造成了不小的障碍。针对现有气象数据插补方案的不足,提出了一种全新的基于动态时间规整(dynamic time warping,DTW)的气温日值数据二次插补方法。该方法采用了一种实时的插补策略,主要技术内容包括:1)利用一元线性回归方程将原始气温观测时间序列分解出拟合直线和残差曲线,并将二者重构组成新的气温序列;2)给出了气温插补区的定义和插补条件;3)提出了利用动态时间规整方法计算站点间距离的新模式。利用山东省2021年的气温实况数据对该方法进行了双随机检验,检验结果表明:该方法可以满足日平均气温、日最高气温和日最低气温数据的插补需求;在插补流程中采用DTW距离测度和二次插补的组合方法,其插补效果优于目前常见的基于站点地理临近关系的组合方法;该方法对地形有一定的敏感性,平原或丘陵地区的插补效果要优于山地地区。

基于二次分解平抑风电波动的混合储能系统容量配置

针对风电并网功率波动问题,提出基于二次分解的混合储能系统容量优化配置方案。首先,根据风电并网功率波动限值,对风电功率进行经验模态分解,并重构为并网参考功率和混合储能系统参考功率,以实现风功率整体平抑;其次,考虑到经验模态分解算法出现的模态混叠、端点效应加剧等问题,提出基于北方苍鹰优化-变分模态分解算法的混合储能系统内部功率分配策略;最后,建立平抑风电出力波动的混合储能容量优化配置模型,并基于K-均值聚类得到的典型日数据对建立的模型进行求解。算例分析表明,所提策略的优化配置方案能够有效平抑风电功率波动,满足风电并网功率波动的要求,减少混合储能系统成本。

空调出风口支架复合抽芯机构注塑模具设计

针对壁挂式空调出风口支架及类似塑件结构的注塑模具,设计了简易二次抽芯和斜顶加弹针的复合抽芯机构。通过对塑件结构形状的分析,发现该塑件沿长度方向分布的5条导风板转轴安装固定用加强筋(带开口槽)的脱模方向与塑件宽度方向的滑块运动方向垂直相交,而且加强筋相互间距很小,无足够空间设计传统复合抽芯机构实现脱模。为解决此问题,在塑件宽度方向受脱模空间限制的一级滑块内设计了5组由弹簧驱动的斜弹块抽芯机构,这5组机构借助一级滑块的开合模动作来实现与一级滑块运动方向垂直且相交方向上倒扣的脱模,塑件长度方向非对称分布加强筋上的倒扣脱模由斜顶加延时弹针组成的内部抽芯机构实现,这既满足了局部倒扣的脱模需求又确保了塑件在不粘斜顶的前提下顺利被顶出模具。该模具设计方案简化了传统二次抽芯机构(由液压缸及斜导柱分步驱动)的结构,解决了因结构复杂导致的模具加工周期长、模具尺寸及注塑机吨位变大、注塑成本上升等问题。经长期生产验证,模具成型的塑件合格、注塑过程稳定可靠,可为类似注塑产品及模具结构的开发提供参考。

电饭煲中桶模具设计

对电饭煲中桶结构进行分析,设计了1副两板模,定模部分对多种不同结构的扣位进行成型,在定模设计了相应的滑块机构,为了驱动定模滑块脱模,在模架侧面安装辅助开模机构,将第1次开模设在定模座板与定模板之间。根据动模部分成型不同结构的扣位,分别设计了内滑块脱模结构和斜推脱模结构。模具采用普通流道浇注系统,从待成型塑件上端圆孔的内壁以4个潜伏式浇口进料。为了使模具温度均匀,在定模设置了直通水路,在动模设置了隔片式水井水路。

回锅肉工业化生产中蒜苗处理工艺研究

该实验主要研究了回锅肉工业化生产中蒜苗的处理工艺对产品品质的影响,以及回锅肉在贮藏期内理化指标、菌落总数、风味物质的变化。采用单因素实验和正交实验,以感官评分为指标,得出回锅肉中蒜苗的最佳处理工艺为蒜苗切断长度4 cm、蒜苗护色时间50 min、蒜苗炒制时间15 s、蒜苗与猪肉的拌料时间6 min。此配方下炒制的回锅肉的感官评分为82.86分。将回锅肉袋装、抽真空、热封、巴氏杀菌30 min后在-18℃条件下贮藏,每3 d测定一次回锅肉的色泽、质构、电子鼻、过氧化值和菌落总数。结果表明,随着贮藏时间的延长,水分流失导致猪肉的质构逐渐变硬,蒜苗叶片和苔茎基本无变化,整体色泽亮度均呈下降趋势;风味物质含量不断增加,每个贮藏阶段都有新的风味物质出现;过氧化值逐渐升高,菌落总数逐渐增加,但均在国家标准规定范围内。该研究结果可为川菜肉类菜肴的生产和贮藏提供有力的理论基础和数据支撑。

基于二次分解因果分析和深度学习的短期风电功率预测

为实现精准的风电功率预测,提出了一种基于二次分解因果分析和深度学习的风电功率预测模型。首先,通过完备集成经验模态分解算法对风电功率和风速序列进行一次分解,并采用经验小波变换算法对风电功率和风速序列的高频分量进行二次分解,以降低原始序列的复杂程度。其次,通过Granger因果关系检验方法对各风速分量与风电功率分量进行因果分析,以此实现风电功率各分量的输入变量选择。最后,利用耦合注意力机制的双向门控循环单元对风电功率分量进行预测,并集成得到最终的风电功率预测结果。通过风电厂实际运行数据进行试验,并与多个典型模型进行比较,结果表明所提模型具有较高的预测精度,其决定系数达到了0.98,能够实现较精准的风电功率预测。

水性笔笔杆注射模设计

通过对水性笔笔杆结构和成型工艺进行分析,设计了4次分型与2次脱模的模具结构,模具保证了进料套进料和型芯抽芯的顺利进行,解决了笔杆因结构复杂难以脱模的难题。经生产实践验证:模具结构设计合理、动作运行稳定、成型的塑件尺寸精度符合要求,对同类塑件的注射模设计可提供参考。

二次滤网主轴包静密封失效分析及设计改进

为了解决某核电机组二次滤网主轴包静密封漏水故障,采用性能测试、力学及有限元分析方法寻找二次滤网主轴包静密封失效原因。研究结果表明,主轴包静密封失效的根本原因是该处密封设计不合理,使得该密封圈运行时承受周期性外力作用,导致密封圈的疲劳老化,最终造成静密封失效。对此,提出了针对性的设计改进,提高了二次滤网主轴包静密封的密封可靠性。