Intrinsic product polarization and branch ratio in the S（~1D,~3P）＋HD reaction on three electronic states

The intrinsic product polarization and intramolecular isotope effect of the S（~1D,~3P） ＋ HD reaction have been investigated on both the lowest singlet state（1A） and the triplet state（3A and 3A） potential energy surfaces by using quasi-classical trajectory and quantum mechanical methods.The calculations indicate that intramolecular isotope effects are different on the three electronic states.The stereodynamics study shows that the P（θr） distributions,P（φ r） distributions,and polarization-dependent differential cross sections（PDDCSs）（00） are sensitive to mass factor and the product angular momentum vectors are not only aligned but also oriented.

Branching ratio and angular distribution of ejected electrons from Eu 4f^76p_(1/2)nd auto-ionizing states

The branching ratios of ions and the angular distributions of electrons ejected from the Eu 4f^76p_（1/2）nd auto-ionizing states are investigated with the velocity-map-imaging technique.To populate the above auto-ionizing states,the relevant bound Rydberg states have to be detected first.Two new bound Rydberg states are identified in the region between41150 cm^（-1）and 44580 cm^（-1）,from which auto-ionization spectra of the Eu 4f^76p_（1/2）nd states are observed with isolated core excitation method.With all preparations above,the branching ratios from the above auto-ionizing states to different final ionic states and the angular distributions of electrons ejected from these processes are measured systematically.Energy dependence of branching ratios and anisotropy parameters within the auto-ionization spectra are carefully analyzed,followed by a qualitative interpretation.

Branching ratios of autoionization from Eu 4f^76p_(1/2)6d [J] autoionizing states

The autoionization branching ratios from Eu 4f76p1/26 d [J] autoionizing states to its 4f76s+(9So), 4f76s+(7So), and4f75d+(9Do) final ionic states are investigated with the combination of the three-step laser excitation and the velocity-map imaging technique. These different autoionizing states are excited via 4f76s6d8 DJ [J = 5/2, 7/2, and 9/2] intermediate states, respectively. The experimental photoelectron images are obtained, from which energy distributions of ejected electrons are achieved with the mathematical transformation. Furthermore, the energy dependence of the branching ratio is investigated within the autoionization resonance, by which population inversion is observed as an important characteristic.The J-dependence is also studied systematically. The validity of the well-known isolated core excitation technique used for obtaining the autoionization spectrum is also studied.

Early administration of branched-chain amino acid granules

The effect of malnutrition on survival in patients with decompensated liver cirrhosis has not been well defined. Nutritional intervention with branched-chain amino acid (BCAA) can increase serum albumin concentration in patients with decompensated cirrhosis but its effects on survival are unclear. The BCAA to tyrosine ratio (BTR) is a surrogate marker (the normal range of BTR is between 4.41 and 10.05, and a Fischer's ratio of 1.8 corresponds to a BTR of 3.5) in patients with decompensated liver cirrhosis, and BCAA inhibits hepatic carcinogenesis in patients with compensated cirrhosis. This review discusses data regarding the effect of early administration of BCAA granules based on the ratio of BCAA to BTR on prognosis in patients with cirrhosis.

Photodissociation Branching Ratios of 12C^16O from 108000 cm^-1 to 113200 cm^-1 Measured by Two-Color VUV-VUV Laser Pump-Probe Time-Slice Velocity-Map Ion Imaging Method:Observation of Channels for Producing O(1D)

The photoabsorption and photodissociation of carbon monoxide(CO)in the vacuum ultraviolet(VUV)region is one of the most important photochemical processes in the interstellar medium,thus it has attracted numerous experimental and theoretical studies.Here,we employed the two-color VUV-VUV laser pump-probe time-slice velocity-map ion imaging method to measure the relative branching ratios[C(3P0)+O(1D)]/{[C(3P0)+O(3P)]+[C(3P0)+O(1D)]}and[C(3P2)+O(1D)]/{[C(3P2)+O(3P)]+[C(3P2)+O(1D)]}in the VUV photoexcitation energy range of 108000-113200 cm^−1.Here,one tunable VUV laser beam is used to excite CO to speci c rovibronic states,and a second independently tunable VUV laser beam is used to state-selectively ionize C(3P0)and C(3P2)for detection.State-selective photoionization through the 1VUV+1UV/visible resonance-enhanced multiphoton ionization scheme has greatly enhanced the detection sensitivity,which makes many new weak absorption bands observable in the current study.The branching ratio measurement shows that the spin-forbidden channels C(3P0)+O(1D)and C(3P2)+O(1D)only open at several discrete narrow energy windows.This might be caused by certain accidental resonanceenhanced spin-orbit interactions between the directly excited Rydberg states and valence states of triplet type which nally dissociate into the spin-forbidden channels.

Branched-chain amino acids to tyrosine ratio value as a potential prognostic factor for hepatocellular carcinoma

The prognosis of hepatocellular carcinoma(HCC) depends on tumor extension as well as hepatic function.Hepatic functional reserve is recognized as a factor affecting survival in the treatment of HCC;the ChildPugh classif ication system is the most extensively used method for assessing hepatic functional reserve in patients with chronic liver disease,using serum albumin level to achieve accurate assessment of the status of protein metabolism.However,insuff icient attention has been given to the status of amino acid(AA) metabolism in chronic liver disease and HCC.Fischer's ratio is the molar ratio of branched-chain AAs(BCAAs:leucine,valine,isoleucine) to aromatic AAs(phenylalanine,tyrosine) and is important for assessing liver metabolism,hepatic functional reserve and the severity of liver dysfunction.Although this ratio is diff icult to determine in clinical situations,BCAAs/tyrosine molar concentration ratio(BTR) has been proposed as a simpler substitute.BTR correlates with various liver function examinations,including markers of hepatic f ibrosis,hepatic blood flow and hepatocyte function,and can thus be considered as reflecting the degree of hepatic impairment.This manuscript examines the literature to clarify whether BTR can serve as a prognostic factor for treatment of HCC.

Ab initio Study of the Potential Energy Surface and Product Branching Ratios for Reaction of O（^1D） with C2H5CI

O 的势能表面(1 D )+C 2 H 5 Cl 反应用 QCISD (T)/6 311++G 被学习(d， p )// MP2/6 31G (d， p ) 方法。计算揭示插入消除机制。O 的插入反应(1 D ) 并且 C 2 H 5 Cl 生产二充满精力的中介， IM1 和 IM2，它随后分解成各种各样的产品。通过二中介形成的各种各样的产品的分叉的比率的计算在 0， 20.9， 41.8， 62.7， 83.6， 104.5，和 125.4 kJ/mol 的碰撞精力用 RRKM (Rice-Ramsperger-Kassel-Marcus ) 理论被执行。HCl 是为 IM1 的主要分解产品；CH 2 哦是为 IM2 的主要分解产品。因为 IM1 比 IM2 更稳定， HCl 可能是 O 的主要产品(1 D )+C 2 H 5 Cl 反应。

影响‘红满堂’绿枝插条生根因子的研究

[目的]研究扦插基质、插穗部位、生长调节剂及生长调节剂处理时间对‘红满堂’品种绿枝扦插生根效果的影响,筛选绿枝扦插的适宜组合,可为其工厂化育苗提供理论依据和技术支撑。[方法]以‘红满堂’品种当年生绿枝为材料,采用L9(34)正交试验设计,从扦插后3 d开始,每3~4 d观察插穗基部变化,并记录插穗生根状况,在扦插50 d时,调查不同处理水平下插穗的生根率以及不定根数量、不定根均长和最长根长,综合评价生根效果。[结果]影响‘红满堂’品种绿枝扦插生根的主导因子是插穗部位,同一枝条发育充实、木质化程度相对较高的中、下部位插穗的生根率(36.67%、40.67%)显著高于上部插穗(9.33%)。生长调节剂的种类、浓度和处理时间长短是影响扦插繁殖的关键因素,对扦插繁殖的生根率、不定根条数、不定根均长、最长不定根长和生根效果综合评价值均有极显著影响,不同生长调节剂和时间处理‘红满堂’绿枝扦插的生根率、不定根条数、不定根均长、最长不定根长、生根效果综合评价值分别为14.67%~38.00%和23.33%~36.00%、2.40~5.03条和3.40~4.57条、1.93~2.27 cm和1.10~2.93 cm、2.47~3.41 cm和1.66~3.39 cm、43.70%~86.40%和56.00%~81.07%。扦插基质显著影响不定根的生长发育,不同基质的不定根条数、不定根均长、生根效果综合评价值分别为3.37~5.00条、1.34~3.10 cm、58.43%~76.37%。[结论]‘红满堂’品种绿枝扦插属综合生根类型,以愈伤组织生根类型为主。绿枝插穗生根最佳处理组合为:采用当年生绿枝下部做插穗,用生长调节剂IBA(吲哚丁酸)2500 mg·L^(-1)浸蘸插穗基部20 s,扦插于椰糠∶蛭石∶珍珠岩(1∶2∶4)的基质中。根系发育最佳的处理组合为:采用当年生绿枝的中间部位做插穗,用生长调节剂IBA 2500 mg·L^(-1)浸蘸插穗基部5 s,扦插于草炭∶蛭石∶珍珠岩(1∶2∶4)的基质中。

^(96)Y衰变能谱的精确计算

精确计算衰变能谱对探索不稳定原子核结构、获取中微子能谱及验证衰变理论等均有重要科学价值与意义。衰变能谱的精确计算依赖于衰变分支比和单条能级衰变能谱,前者通常利用γ-γ符合测量或全吸收谱仪对β衰变产物进行直接测量而获得,后者通常由费米衰变理论计算获得。本文以^(96)Y衰变为例,对^(96)Y衰变的实验衰变分支比数据进行评价,然后结合费米衰变理论进行理论分析,为提高能谱的精度,对能谱加入了形状因子修正,最终获得了高精度的^(96)Y衰变能谱。

基于分子态构型研究单粲味五夸克态的产生

基于有效拉氏量方法,本文研究了自旋宇称为J^(P)=1/2-的单粲味五夸克态的产生.本文根据强子可能的分子态图像,分别以NDs或NDs*不同的分子态构型,讨论了Bs介子产生单粲味五夸克态csuud和十重态重子csuud,以及该五夸克态的两体强衰变过程.通过复合粒子判据,计算出与单粲味五夸克态csuud相关的强耦合常数.借助于强子的有效拉氏量方法,最终得到了单粲味五夸克态的产生分支比.结果表明,在单粲味五夸克态csuud为NDs的构型下,具有Cabibbo允许的产生过程:csuud的分支比可以达到10-5量级,而在NDs*的构型下,该过程的分支比仅为10^(-8)量级.本文的研究结果可以为单粲味五夸克态的实验搜寻和深入研究提供参考,并期望在将来的实验探测诸如LHCb,BelleⅡ,BaBar等B工厂中得到验证.

不同枝果比和套袋对火龙果产量和品质的影响

以‘大红’火龙果为试验材料,探究不同枝果比和套袋对火龙果产量和品质的影响。结果表明,不同枝果比对果实单果重和大果率有显著影响,但对果实可溶性固形物等其他品质影响差异不显著。单果重随枝果比的增大而增大,其中以5∶1枝果比提升效果最明显,大果率达100%,但产量最低;3∶1枝果比的单果重和产量适中,且在可溶性固形物、可食率、果皮厚度和感观评分上表现较好。套袋显著降低果实单果重、产量和感官评分,降低可食率,对大果率、果皮厚度、可溶性固形物等影响不显著;除黑色尼龙网袋外,其余套袋处理均增加果实煤烟病发生率,降低果实外观品质;牛皮袋果面光泽度高,颜色鲜红,萼片绿色程度最高;白纸袋对促进萼片转红效果最佳。在生产中,推荐3∶1的枝果比+黑色尼龙网袋,能更大限度保证产量,有效提高果实品质。

基于定量血流分数的冠状动脉真性分叉病变介入治疗术后分支灌注受损的危险因素分析

目的:拟利用基于Murray定律的定量血流分数分析冠状动脉真性分叉病变介入治疗术后无肉眼可见分支血流减慢而分支出现血流灌注受损的影响因素。方法:连续纳入2022年6月至2023年9月于湖南省人民医院接受经皮冠状动脉介入治疗(PCI)的非左主干冠状动脉真性分叉冠心病患者211例,分叉病变共计234支。收集患者的一般临床指标、冠状动脉分叉病变的解剖学特征数据、分支保护方式、术后分支TIMI血流等资料,并对术后分支血管进行基于Murray定律的定量血流分数(μQFR)测定。PCI术后μQFR<0.8认为分支有灌注障碍,分为术后分支灌注受损组(n=51,53支分支病变),另μQFR≥0.8的患者为术后分支灌注正常组(n=160,181支分支病变)。通过多因素Logistic回归分析评估多种临床及解剖学因素对PCI术后分支灌注的影响。结果:所有患者PCI术后分支血流分级均为TIMI3级,术后分支灌注受损组53支(22.6%)血管术后分支μQFR为0.70±0.10,术后分支灌注正常组为0.93±0.05,两组比较差异具有统计学意义(P<0.001)。与术后分支灌注正常组比较,术后分支灌注受损组分支病变长度、分支参考直径、术后分支开口直径狭窄率、术后分支最狭窄管腔直径狭窄率升高,主支与分支直径比、术前分支最狭窄管腔直径狭窄率、术前主支μQFR降低,差异均有统计学意义(P均<0.05)。术后分支开口直径狭窄率(r=-0.490,P<0.001)、术后分支最狭窄管腔直径狭窄率(r=-0.788,P<0.001)、术前分支最狭窄管腔直径狭窄率(r=-0.280,P<0.001)、术后分支最狭窄管腔直径(r=-0.469,P<0.001)、分支病变长度(r=-0.157,P=0.016)与术后分支μQFR呈显著负相关,分支参考直径(r=0.173,P=0.008)、主支分支直径比(r=0.194,P=0.003)、术后分支开口直径(r=0.328,P<0.001)与术后分支μQFR呈正相关,与临床基线资料均无明显相关性(P均>0.05)。多因素Logistic回归分析,结果显示共有4个因素是术后分支灌注受损的危险因素:术后分支最狭窄管腔直径狭窄率(OR=1.228,95%CI:1.144~1.318,P<0.001),术后分支开口直径狭窄率(OR=1.110,95%CI:1.055~1.168,P<0.001),术后主支最狭窄管腔直径狭窄率(OR=1.115,95%CI:1.042~1.192,P=0.001),分支病变长度(OR=1.121,95%CI:1.021~1.231,P=0016)。结论:PCI术后分支血流达到TIMI 3级的患者中仍有部分存在血流动力学障碍,PCI术后应积极行功能学评估。术后分支最狭窄管腔直径狭窄率、术后分支开口直径狭窄率、术后主支最狭窄管腔直径狭窄率、分支病变长度是冠状动脉分叉病变PCI术后分支灌注障碍的危险因素。

14N_(2)和15N_(2)在解离通道N(2D_(5/2,3/2))+N(2D_(5/2:3/2))阅值以上光解离产物精细结构分支比N(2D_(5/2))/N(2D_(3/2))的测量

精确测量解离产物的自旋-轨道耦合精细结构分支比对于进一步了解小分子的光解动力学具有十分重要的意义。本文利用真空紫外泵浦-真空紫外探测时间切片离子速度成像装置,测量了14N_(2)的c4′1∑_(u)^(+)(v′=6)态和b′1∑_(u)^(+)(v′=21)态以及15N_(2)的b′∑_(u)^(0)(=20)态和b′1∑_(u)^(+)(v′=20)态和b′1∑_(u)^(+)(v′=21)解离至通道N(2D_(5/2,3/2))+N(2D_(5/2.3/2))产物精细结构分支比N(2D_(5/2))/N(2D_(3/2)).实验结果表明,产物精细结构分支比N(2D_(5/2))/N(2D_(3/2))与14N_(2)或15N_(2)所在的转动能级无关而与其电子态和振动能级的性质有关。14N_(2)的c4′1∑_(u)^(+)(v′=6)态和15N_(2)的b′1∑_(u)^(+)(v′=20)态均接近解离通道N(2D_(5/2,3/2))+N(2D_(5/2,3/2))的阈值,产物精细结构分支比N(2D_(5/2))/N(2D_(3/2))数值均为-1.35;而14N_(2)和15N_(2)的b′∑_(u)^(+)(v′=21)态均远高于解离通道N(2D_(5/2,3/2))+N(2D_(5/2,3/2))的阈值,产物精细结构分支比N(2D_(5/2))/N(2D_(3/2))数值均为-1.00.本文猜测氮气在接近解离通道值时是一个遵循统计规律的解离过程,而在远高于解离通道阈值时是一个非绝热过程,这可能是本实验中观测到的产物精细结构分支比振动依赖现象的原因.要定量解释本实验的测量结果,需要在该解离通道阈值附近的氮气高精度势能曲线及其相互作用信息。

La_(2)Ce_(2)O_(7):Ho^(3+)/Yb^(3)陶瓷的荧光温度传感性能研究

为研究La_(2)Ce_(2)O_(7):Ho^(3+)/Yb^(3+)陶瓷的荧光温度传感性能,采用高温固相反应法制备该材料,在La_(2)Ce_(2)O_(7)晶格中,使Ho^(3+)和Yb^(3+)都取代La^(3+)的位置,其中,Ho^(3+)离子浓度为0.05%at.%,Yb^(3+)离子浓度在10%~18%at.%范围内。在980 nm波长的激光激发下,检测到上转换(Up-conversion,UC)绿光的强度在550 nm处达到峰值,红光强度在666 nm处达到峰值。当Ho^(3+)和Yb^(3+)的掺杂浓度分别为0.05%at.%和14%at.%时,UC发射强度最强。研究了La_(2)Ce_(2)O_(7)∶Ho^(3+)/Yb^(3+)陶瓷在303~483 K温度范围内的温度传感性能,在303 K温度条件下得到最高绝对灵敏度(Sa)为0.0028 K^(-1),在303 K温度条件下得到最高相对灵敏度(Sr)为0.0054 K^(-1),表明La_(2)Ce_(2)O_(7)∶Ho^(3+)/Yb^(3+)陶瓷可以作为潜在的远程温度传感器候选材料。

基于直流外送的水风光大基地最优容量配比研究

水风光大基地一体化运行是提高直流外送通道利用率、增加清洁能源电量、降低成本电价的重要方式,其难点在于确定风光水大基地的最优容量配比。首先构建水风光大基地系统模型,然后以投资经济性最优为目标,以风光水出力特性、直流通道输送容量为约束,建立时序生产模拟模型,并采用分支定界法求解模型。以金下界河上的梯级电站为例,通过对比不同水风光配比下的新增电量、提升设备利用率和成本电价,给出兼顾环保性、安全性、经济性的最优配比。研究结果可为水风光大基地电规划与建设提供参考依据。

长江南京河段八卦洲汊道河道整治工程效果分析与思考

依据历史水文资料,在地形测量、水文测验基础上,从分流比的变化、岸线及深泓变化、横断面变化等几个角度对长江南京河段八卦洲汊道河道整治工程实施效果进行分析,结果显示工程的实施有效维持了左右汊河势格局,抑制了右汊发展,进一步保障了防洪安全,发挥了工程效益,同时根据分析结果思考提出今后长江八卦洲河段及下游河道整治工程应关注的一些问题。

全局求解一类线性比式和问题的分支定界算法

针对一类线性比式和规划问题(SLR)提出一种新的分支定界算法.首先通过Charnes-Cooper变换和引进新的变量将该问题转化为等价非线性规划问题(EP).其次在给定子盒子上对问题(EP)非凸约束的凹部分进行线性近似,得到一个凸二次规划问题(SOCR).然后用所提出的算法求问题(SLR)的全局最优解.最后从理论上证明了算法的收敛性和计算复杂度,数值实验表明该算法是可行有效的.

桑枝和蚕沙的基础成分测定及堆肥试验

桑枝和蚕沙是蚕桑生产的大宗副产物,用其制作堆肥是资源化利用和无害化处理的有效途径。测定结果表明,桑枝条的木质化程度越高,枝条的碳氮比(C/N)也越高;混入残余桑叶碎片和叶梗的蚕沙与蚕粪比较,其C/N显著降低。堆肥试验设置1号堆(100%桑枝)、2号堆(20%蚕沙+80%桑枝)、3号堆(100%蚕沙)3个处理组,测定各组堆肥腐熟过程中的物质变化及腐熟后的堆肥品质,结果显示:堆肥过程中各堆体的高温(≥50℃)持续天数由长到短依次为1号堆、2号堆、3号堆;堆肥的前60 d是堆体中各种养分物质含量变化最为剧烈的时期。各处理组堆体腐熟后,有机质含量由高到低依次为1号堆、2号堆、3号堆,有效氮、磷、钾及速效总养分含量由高到低依次为3号堆、2号堆、1号堆。综上认为:堆肥需要根据原料的组成合理调节氮源用量;2号处理组堆肥的品质最优,即在桑枝堆体中添加一定量的蚕沙,既可保证较高的有机质含量,又可提高堆肥的速效肥力。

Relative spectral response calibration using Ti plasma lines

This work introduces the branching ratio(BR) method for determining relative spectral responses,which are needed routinely in laser induced breakdown spectroscopy(LIBS). Neutral and singly ionized Ti lines in the 250–498 nm spectral range are investigated by measuring laser-induced micro plasma near a Ti plate and used to calculate the relative spectral response of an entire LIBS detection system. The results are compared with those of the conventional relative spectral response calibration method using a tungsten halogen lamp, and certain lines available for the BR method are selected. The study supports the common manner of using BRs to calibrate the detection system in LIBS setups.

基于倒S形枝节的宽带圆极化天线设计

为满足无线通信日益增长的带宽需求,扩展圆极化微带天线阻抗带宽和轴比带宽的同时保持无线设备的小型化,本文基于微带缝隙天线提出了一种宽带圆极化微带天线的设计。该天线整体尺寸为30 mm×30 mm×1.6 mm,顶部结构为倒S形枝节,采用偏心侧馈的馈电方式,通过在微带线上加载矩形短截线改善天线的阻抗匹配,扩展了天线的阻抗带宽,在接地板上切角、挖槽扩展了天线的轴比带宽。测量结果表明,天线的-10 dB阻抗带宽为62.1%(5.14~9.81 GHz),3 dB轴比带宽为63.9%(4.43~8.59 GHz)。该天线具有小型、宽频带的特性,适用于5.8 GHz频段和WiFi-6E频段的无线通信系统中。