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管理层自利行为与外部监督——基于信息披露的信号博弈

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中国管理科学 2019年第2期27卷 187-196页

作者：孙彤薛爽上海财经大学会计学院会计与财务研究院上海200433

代理理论框架下的企业高层管理者具有普遍的自利倾向,而信息不对称是产生代理问题的重要原因。缓解代理问题的方法不外乎监督,激励和减少信息不对称。现有文献通常分别考察以上三种机制对缓解代理问题的作用,本文则构建了管理层与企业... 详细信息

代理理论框架下的企业高层管理者具有普遍的自利倾向,而信息不对称是产生代理问题的重要原因。缓解代理问题的方法不外乎监督,激励和减少信息不对称。现有文献通常分别考察以上三种机制对缓解代理问题的作用,本文则构建了管理层与企业外部监督者之间的信号博弈模型,同时考虑监督、激励和信息披露之间的互动,分析外部监管对高管自利行为的有效监督机制。研究表明:在缺少激励机制的情况下,以信息披露质量为信号的博弈仅存在一个低效率的混合均衡,即无论高管是否存在自利行为,都会选择低的信息披露质量。而在对高管选择高质量的信息披露策略给予一定的奖励时,可以实现分离均衡。由此我们提出新的包含奖励的信息披露激励机制以及在这一机制下外部监管者的最优策略选择。利用金牌董秘的评选及其对外部监管的信号效应,我们为理论模型的结论提供了实证支持。

关键词：信号博弈委托代理自利行为激励机制

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含铬铝泥制备纳米AlO(OH)片

现代化工 2015年第2期35卷 73-76页

作者：李微孙彤渤海大学化学化工与食品安全学院辽宁锦州121013 渤海大学辽宁省应用化学重点实验室辽宁锦州121013

含铬铝泥是一种危险固体废弃物.以含铬铝泥酸溶液为原料,采用沉淀法制备了纳米AlO（OH）片,并对样品进行了XRD、FT-IR、SEM表征分析.研究结果表明,随着加水量增加,含铬铝泥的溶解率增大,当水的加入量为10 mL/g泥时,含铬铝泥的溶解率最大... 详细信息

含铬铝泥是一种危险固体废弃物.以含铬铝泥酸溶液为原料,采用沉淀法制备了纳米AlO（OH）片,并对样品进行了XRD、FT-IR、SEM表征分析.研究结果表明,随着加水量增加,含铬铝泥的溶解率增大,当水的加入量为10 mL/g泥时,含铬铝泥的溶解率最大;随着H2SO4加入量的增加,含铬铝泥的溶解率增大,且当H2SO4加入量为9mL/（g泥）时,含铬铝泥的溶解率最大;随着溶解温度的升高,含铬铝泥的溶解率增大,且当溶解温度为70℃时,含铬铝泥的溶解率最大.采用含铬铝泥制备的样品为厚约8 nm、长宽约为100～200 nm分散性较好的片状纳米AlO（OH）.

关键词：含铬铝泥 AlO(OH) 纳米片状

Influence of pH on composite photocatalyst of bismuth and titanium

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Influence of pH on composite photocatalyst of bismuth and ti...

第九届全国环境催化与环境材料学术会议——助力两型社会快速发展的环境催化与环境材料

作者： tong sun Chun Chang Yunyun Zhu Shuying Xu College of Chemistry Chemical Engineering Bohai University Nanjing Zhongke Group Co. Ltd

The composite photocatalysts of bismuth and titanium were prepared by a hydrothermal method,and the effects of hydrothermal pH value on the characterization and photocatalytic activity were *** photocatalytic activities of the photocatalysts were evaluated by the degradation of rhodamine B(RhB)in the water under ultraviolet light irradiation and visible *** results show that high concentration of hydroxyl is propitious to forming BiO and

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高强钢管约束超高性能混凝土梁抗弯性能研究

天津大学学报（自然科学与工程技术版） 2021年第11期54卷 1111-1120页

作者：邓宗才孙彤李佳跃城市与工程安全减灾省部共建教育部重点实验室(北京工业大学) 北京100124

高强钢管约束超高性能混凝土(ultra-high performance concrete,UHPC)具有自重轻、承载力及刚度高和耐火性能好的优势,在工程中具有良好的应用前景.为研究高强钢管约束UHPC构件在纯弯作用下的力学性能,对1个实心普通强度钢管约束UHPC梁... 详细信息

高强钢管约束超高性能混凝土(ultra-high performance concrete,UHPC)具有自重轻、承载力及刚度高和耐火性能好的优势,在工程中具有良好的应用前景.为研究高强钢管约束UHPC构件在纯弯作用下的力学性能,对1个实心普通强度钢管约束UHPC梁、3个实心高强钢管约束UHPC梁、1个方套方中空夹层高强钢管约束UHPC梁和3个方套圆中空夹层高强钢管约束UHPC梁进行了两点弯曲试验.研究了高强钢管约束UHPC梁在纯弯荷载下的破坏形式以及含钢率、钢材屈服强度和截面组合形式对梁抗弯承载力和抗弯刚度的影响.试验结果表明:高强钢管约束UHPC梁弯矩-曲率的变化过程分为3个阶段:弹性阶段、弹塑性阶段和强化阶段,破坏时表现出良好的延性.高强钢管UHPC梁的受压区未出现局部凸起.钢管厚度为4 mm、6 mm和8 mm的实心高强钢管UHPC梁含钢率分别为0.116、0.188和0.253,相比4 mm厚的实心高强钢管UHPC梁,6 mm和8 mm厚的实心高强钢管UHPC梁抗弯承载力分别提高35.9%、58.5%;使用抗弯刚度分别提高12.9%、32.4%.相比于外钢管取6 mm厚的实心和方套方中空夹层钢管UHPC梁,方套圆中空夹层钢管UHPC梁的抗弯承载力分别提高26.8%、10.3%;使用抗弯刚度分别提高3.5%、4.5%.由于高强度微细钢纤维良好的阻裂和控裂能力,高强钢管约束UHPC梁在弹塑性变形阶段的刚度较高.受力过程中UHPC的弹性模量衰减速率低于普通混凝土,因此,基于叠加法,考虑钢纤维UHPC的控裂能力,建立了高强钢管约束UHPC梁使用阶段抗弯刚度的计算式,理论计算值与试验值吻合良好.

关键词：高强钢管超高性能混凝土受弯力学性能折减系数抗弯刚度抗弯承载力

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基于视觉检测与跟踪技术在机器人中的应用

组合机床与自动化加工技术 2016年第2期 79-81页

作者：孙同同孙首群上海理工大学机械工程学院上海200093

近几年机器视觉技术在国内外已经取得了比较好发展,并且广泛应用于工农业生产领域。针对机器人视觉系统进行全过程的研究,通过安装在机器人上的摄像头来采集一组图像序列,通过图像系统精确地检测出实时运动的物体并进行瞬时跟踪。研究... 详细信息

近几年机器视觉技术在国内外已经取得了比较好发展,并且广泛应用于工农业生产领域。针对机器人视觉系统进行全过程的研究,通过安装在机器人上的摄像头来采集一组图像序列,通过图像系统精确地检测出实时运动的物体并进行瞬时跟踪。研究几组对阈值距离不超过0.5m的图像进行二值化处理,然后进行时间差分。最后采用激光通信这种现代控制理论和最优控制算法提高目标检测与跟踪精度。结果表明,通过对比激光通信这种算法,稳定性高,精度好,耗时短。

关键词：机器视觉图像序列跟踪二值化激光通信

Calcineurin is involved in cardioprotection induced by ischemic postconditioning through attenuating endoplasmic reticulum stress

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Chinese Medical Journal 2011年第20期124卷 3334-3340页

作者： CHEN Yi-hong WU Xu-dong YAO Shu-tong sun Seng LIU Xiu-hua Department of Pathophysiology Chinese People＇s LiberationArmy General Hospital Beijing 100853 China

Background Ischemic postconditioning （I-postC） is a newly discovered and more amenable cardioprotective strategy capable of protecting the myocardium from ischemia/reperfusion （I/R） injury. Endoplasmic reticulum （ER） is a principal site for secretary protein synthesis and calcium storage. Myocardial I/R causes ER stress and emerging studies suggest that the cardioprotection has been linked to the modulation of ER stress. The aim of the present study was to determine whether cardioprotection of I-postC involves reduction in ER stress through calcineurin pathway. Methods In the in vivo model of rat myocardial I/R, myocardial infarct size was measured by triphenyltetrazolium chloride （TTC） staining and apoptosis was detected using terminal eoxynucleotidyl transferase-mediated deoxyuridine triphosphate nick-end labeling （TUNEL） assay. Expression of calreticulin, C/EBP homologous protein （CHOP）, caspase-12, and activation of caspase-12 in myocardium were detected by Western blotting. The activity and expression of calcineurin in myocardium were also detected. Results I-postC protected the I/R heart against apoptosis, myocardial infarction, and leakage of lactate dehydrogenase （LDH） and creatine kinase-MB （CK-MB）. I-postC suppressed I/R-induced ER stress, as shown by a decrease in the expression of calreticulin and CHOP, and caspase-12 activation. I-postC downregulated calcineurin activation in myocardium subjected to I/R. Conclusion I-postC protects myocardium from I/R injury by suppressing ER stress and calcineurin pathways are not associated with the I-postC-induced suppression of ER stress-related apoptosis.

关键词： ischemic postconditioning endoplasmic reticulum stress calcineurin rats myocardial infarction

Exogenous acid fibroblast growth factor inhibits ischemia-reperfusion-induced damage in intestinal epithelium via regulating P53 and P21WAF-1 expression

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World Journal of Gastroenterology 2005年第44期11卷 6981-6987页

作者： Wei Chen Xiao-Bing Fu Shi-Li Ge tong-Zhu sun Zhi-Yong Sheng Key Research Laboratory of Wound Repair Burns Institute 304^th Clinical Department General Hospital of PLABeijing 100037 China Institute of Radiation Medicine Beijing 100850 China

AIM： To detect the effect of acid fibroblast growth factor （aFGF） on P53 and P21WAF-1 expression in rat intestine after ischemia-reperfusion （I-R） injury in order to explore the protective mechanisms of aFGF. METHODS： Hale rats were randomly divided into four groups, namely intestinal ischemia-reperfusion group （R）, aFGF treatment group （A）, intestinal ischemia group （I）, and sham-operated control group （C）. In group I, the animals were killed after 45 min of superior mesenteric artery （SHA） occlusion. In groups R and A, the rats sustained for 45 min of SHA occlusion and were treated with normal saline （0.15 mL） and aFGF （20 μg/kg, 0.15 mL）, then sustained at various times for up to 48 h after reperfusion. In group C, SHA was separated, but without occlusion. Apoptosis in intestinal villi was determined with terminal deoxynucleotidyl transferase-mediated dUTP-biotin nick-end labeling technique （TUNEL）. Intestinal tissue samples were taken not only for RT- PCR to detect P53 and P21WAF-1 gene expression, but also for immunohistochemical analysis to detect P53 and P21WAF-1 protein expression and distribution. RESULTS： In histopathological study, ameliorated intestinal structures were observed at 2, 6, and 12 h after reperfusion in A group compared to R group. The apoptotic rates were （41.17±3.49）%, （42.83±5.23）%, and （53.33±6.92）% at 2, 6, and 12 h after reperfusion, respectively in A group, which were apparently lower than those in R group at their matched time points （50.67±6.95）%, （54.17±7.86）%, and （64.33±6.47）%, respectively, （P〈0.05））. The protein contents of P53 and P21WAF-1 were both significantly decreased in A group compared to R group （P〈0.05） at 2-12 h after reperfusion, while the mRNA levels of P53 and P21VVAF-1 in A group were obviously lower than those in R group at 6-12 h after reperfusion （P〈0.05）. CONCLUSION： P53 and P21WAF-1 protein accumulations are associated with intestinal barrier injury induced by I-R insult, while intravenous aFGF can all

关键词： Acid fibroblast growth factor Ischemia Reperfusion P53 gene P21WAF-1 gene

External fixation in early treatment of unstable pelvic fractures

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Chinese Medical Journal 2012年第8期125卷 1420-1424页

作者： HU San-bao XU Hong GUO Heng-bing sun tong WANG Chang-jun Department of Orthopaedics Beijing An Zhen HospitalCapital Medical UniversityBeijiing100029China

Background Patients with pelvic fractures are often treated in hospitals without the capacity to implement an open reduction internal fixation （ORIF）. This often leads to pelvic malunion in patients with unstable pelvic fracture, shock or even death due to uncontrollable pelvic hemorrhage and unstable hemodynamics. This study explored the role of early external fixation （within 7 days） for patients with unstable pelvic fractures. Methods A retrospective analysis was conducted on 32 patients with unstable pelvic fractures treated with early external fixation from January 2005 to January 2010 （Tile type B： 18 cases; C： 14 cases）. The study comprised 28 males and 4 females, with a mean age of （32_＋8） years （range, 21-56 years）. Of these patients, 22 were treated with emergency pelvic external fixation and 10 were treated with external fixation within 1-7 days. Fifteen cases suffered traumatic hemorrhagic shock. A statistical analysis was conducted to compare fluid infusion and blood transfusion volumes within the first 24 hours of these shock patients with another cohort of patients treated without early external fixation from January 1993 to January 1998. Results The average follow-up was （34.7_＋14.6） months （range, 6-66 months）. Six to eight weeks after external fixation, patients could walk with crutches; by 12 weeks, external fixation was removed and all fractures had healed. Seven patients presented with sequelae, including 3 patients with long-term lumbosacral pain, 3 patients with erectile dysfunction and 1 patient with MoreI-Lavallee lesion and other complications. The 15 shock patients in this study （2005-2010 group） required significantly lower volumes of fluid infusion and blood transfusion （Pfluid=0.000; mtransfusion=0.000） as compared to the 1993-1998 cohort. Conclusions The early application of external fixation in unstable pelvic fracture patients positively affects hemodynamic stability, with outstanding efficacy as a final fixation option for unstable

关键词： unstable pelvic fracture external fixator shock

Photopolymerization Initiated with Bis-[O-(α-Methacryl)]-α,β-Dioximes and Tertiary Amines

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Chemical Research in Chinese Universities 1990年第1期6卷 80-84页

作者： tong Weida, sun Meng, Yang Yuliang, Tang Lijun and Yu tongyin (Department of Material Science, Fudan University, Shanghai)

Among sensitizing systems, the combination of benzophenone(BP) and tertiary amines(TA) has been deeply studied. Since the structure of O-acyl-oximes is similar to that of BP and their triplet state energies are nearly equal, we want to know whether the behavior of the photopolymerization initiated with O-acyl-oximes—TA system is the same as that of photopolymerization initiated with

关键词： Photopolymerlzation O-acyl oximes Exiplex