论统计指标的时间性质及其序时平均

文章指出了国内最流行的１０本大学教科书中共同存在的关于统计指标时间性质上的４点错误认识，给出了统计指标时间性质的科学表述。最后，重新定义了时间数列的构成要素，重新划分了时间数列的类型。

量子漂移-扩散等温模型解的长时间性质

研究一维单极量子漂移-扩散等温模型,它是用来模拟超小半导体器件发生量子效应的宏观量子模型之一,反映了电子浓度与静电场位势之间的非线性关系.量子漂移-扩散模型与经典漂移-扩散模型的区别在于前者包含了量子校正项.从数学的角度讲,此模型是由一个非线性四阶抛物方程与一个泊松方程耦合而成的方程组.研究此模型的困难在于非线性四阶抛物方程缺少极大值原理.利用对数索伯列夫不等式与能量估计的方法,在周期边界条件下,证明了当时间趋于无穷大时此模型的解以指数函数的速度趋于它的平均值.

羟基卟啉化合物的电化学、顺磁共振及时间分辨光电压性质

通过循环伏安法、电子顺磁共振谱和时间分辨电压光谱研究了羟基取代基数目和位置的不同对羟基苯基卟啉化合物的电化学、电子顺磁共振和时间分辨光电压性质的影响.研究结果表明,所有氧化还原反应都是在卟啉环上进行的.卟啉周边取代基数目的增加使得卟啉共轭体系平均电子云密度增大,导致体系易氧化而难以还原.对称性增强可能使卟啉化合物的半波电位值向正方向移动,羟基取代基的给电子效应对于卟啉化合物电化学性质的影响起主导作用.常态下卟啉分子没有EPR信号,在光的激发下,卟啉分子由原来的逆磁性分子变成顺磁性的激发三重态分子,这种激发三重态分子在分子轨道上具有两个未成对电子,这两个电子相距很近,彼此之间发生很强的相互作用而产生电子,它的g值随卟啉共轭体系平均电子云密度增大而变大.时间分辨光电压是由分子中的自由光声载流子的存在而产生的,光电压的衰减与分子结构密切相关,它们的电荷分离速度基本上随卟啉周边羟基取代基数目的增加而减慢.

释“还、再、又”

从两个事件的关系的角度来观察"还"、"再"、"又"的语义,三者的语法意义的共同之处是:存在着两个并列的事件,这两个事件有共同的事件主体,说话人着眼于第二个事件。三者的区别表现为下面两点:(1)与"还"相关的两个事件是一个大的事件的两个组成部分,或者是一个事件集合的两个成员。与"再"和"又"相关的两个事件是独立的,它们不从属于一个大的事件或事件集合。(2)三者对第二个事件的时间性质的要求不同,"还"与过去、现在、将来三个时域都相关,"再"与将来时域相关,"又"与过去、现在两个时域相关。

春秋时期的“诅”及其社会影响

春秋时期的“诅”及其社会影响晁福林在我国上古时代社会史的研究中，＂诅＂是很引人注目的一项。这是因为它与人们的社会信仰与鬼神观念很有关系，并且对于某些社会历史事件也有一定的影响。不揣浅陋，对于这个问题进行一些初步的探讨，以求专家指教。祷告于神灵，要某人...

一类广义Boussinesq方程解的稳定性

运用Fourier变换,得到了一类广义Boussinesq方程初值问题整体解的存在唯一性,同时运用不动点理论研究了这类Boussinesq方程孤立波在一个Sobolev空间中的性质.

A trial study of vibration-induced effects on the spontaneous potential

Vibrator excitation generates not only reflections and refractions of wave fields on the subsurface interfaces but also electromagnetic waves with different frequencies. In this paper, we address the vibration-induced effects on the spontaneous potential field. The effects of controllable vibration on the spontaneous potential field were studied under real field geologic conditions. Experimental data confirmed that the vibration-induced effects on the spontaneous potential field do exist under field conditions. Monitoring records over a long time interval showed that there exist three information zones in the vibration-induced effects on the spontaneous potential field. These are the signal-varying zone, the extremestable zone, and the relaxation-recovery zone. Combined with different well-site data, it was concluded that the time-varying features of the anomalies in the information zones was closely related to the properties of the subsurface liquid （oil and water）.

Changes and Correlations of Duroc Muscle pH,Glycogen,Lactic Acid and TBA under Different Storage Condition

The changes and correlations of muscle pH, glycogen, lactic acid and in- tramuscular fat oxidation in Duroc pigs 10 d after their slaughter, and the effects of different storage temperature and time on Duroc muscle pH value, water loss rate, glycogen, lactic acid and 2-thiobarbituric acid （TBA） were studied. The results showed that during the 10 h after the slaughter, the pH value was decreased rapid- ly, the lactic acid content was increased significantly, while the glycogen and TBA contents were remained stable. At the storage temperature of 4 ℃, storage time showed no significant effects on Duroc muscle pH value and glycogen, lactic acid and TBA contents. At the storage temperature of -20 ℃, storage temperature had significant effects on pH value, while no significant effects on other indicators. The correlation analysis demonstrated that during the 10 h after the slaughter, the TBA content was negatively related to glycogen content （P〈0.05）, but positively related to lactic content （P〈0.05）; the pH value was negatively related to lactic acid content （P〈0.05）. At the storage temperature of 4 ℃, the TBA content was negatively relat- ed to water loss rate （P〈0.01） and lactic acid content （P〈0.05）; the water loss rate was positively related to pH value （P〈0.01） and lactic acid content （P〈0.05）. At the storage temperature of -20 ℃, the TBA content was negatively related to pH value （P〈0.01） and positively related to water loss rate （P〈0.05）; the water loss rate was negatively related to pH value （P〈0.01） and lactic acid content （P〈0.05）.

一类SEIR流行病模型的全局稳定性分析

研究了一类具有常数移民的SEIR流行病模型地方病平衡点的全局稳定性。借助于基于时间平均性质的全局稳定性判定的新方法,给出了地方病平衡点全局稳定性的条件,改进了以往文献中关于全局稳定性的结果。

Short—Time Critical Behavior Affected by Weakly Long—Range Interactions

The theoretic renormalization group approach is applied to the study of short-time critical behavior of the Ginzburg–Landau model with weakly long-range interactions . The system initially at a high temperature is firstly quenched to the critical temperature and then released to an evolution with a model A dynamics. A double expansion in and with of order is employed, where is the spatial dimension. The asymptotic scaling laws and the initial slip exponents and for the order parameter and the response function respectively are calculated to the second order in for close to 2.

Surface characteristics,collector adsorption,and flotation response of covellite in oxidizing environment

The surface characteristics,collector adsorption,and flotation response of covellite in the presence of NaClO and FeCl_(3) were investigated using micro-flotation tests,X-ray photoelectron spectroscopy(XPS),time-of-flight secondary ion mass spectrometry(TOF-SIMS),and contact angle measurements.The micro-flotation test results indicated that covellite was effectively inhibited by the presence of NaClO and FeCl_(3).However,the dosages of these depressants were large,and the conditioning time was long.The results of the XPS and TOF-SIMS analyses indicated that NaClO could oxidize the covellite surface and reduce the active sites of Cu.Oxidation products,including CuO and Cu(OH)_(2),were generated on the covellite surface.After the addition of FeCl_(3),the precipitation of iron hydroxide on the covellite surface increased the content of hydrophilic species on the mineral surface.Thus,the adsorption of ammonium dibutyl dithiophosphate on covellite surface was prevented,which reduced the floatability of the covellite.

基于城市用地性质及开发时间的改进空间负荷预测方法研究

传统的空间负荷预测方法涉及数据量大、模型复杂度高、预测速度及精度难以保证。考虑城市用地性质及开发时间,提出了一种基于Logistic回归的改进空间负荷预测方法。该方法将负荷预测问题转换为网格化分区的参数训练和模型的整合预测两个问题,在预测模型中重新构建基于发展速度以及中位年份的参数训练方案,并通过改进Logistic函数的最大似然估计来降低负荷预测的复杂度。仿真结果验证,提出的改进空间负荷预测方法在简化计算复杂度和提升预测精度两方面都优于传统方法,能够有效应用于片区负荷预测。

清代军机处设立的时间及性质

雍正、乾隆时人叶凤毛在其所著《内阁小志》中,谈到了军机处设立的经过:“时西北两路出师征策妄,户部别立军需房,司官翁藻主之。于是袭其称,亦曰军需房,渐易为军机房,渐又以房为处。”这就是说,军机处是由军需房、军机房发展而来的。

Modification of Reflectron Time-of-Flight Mass Spectrometer for Photodissociation of Mass-Selected Cluster lons

We introduce a modification of reflectron time-of-flight mass spectrometer for laser photodissociation of mass-selected ions. In our apparatus, the ions of interests were selected by a mass gate near the first space focus point and decelerated right after the mass gate, were then crossed by a laser beam for dissociation. The daughter ions and surviving parent ions were re-accelerated and analyzed by the reflectron time-of-flight mass spectrometer. Compared to the designs reported by other research groups, our selection-deceleration-dissociation-reacceleration approach has better daughter-parent-ions-separation, easier laser timing, and better overlapping between the ion beam and laser beam. We also conducted detailed cal- culations on the parent ion and daughter ion flight times, and provided a simplified formula for the calibration of daughter ion mass.

Effect of Binders on Aromatization Performance of HZSM-5 Catalyst

The effect of different binders on light hydrocarbon aromatization performance of the HZSM-5 catalyst was investigated. Physicochemical properties of the catalysts, such as the specific surface area, pore volume and acidity, etc., were characterized to correlate with their aromatization performance data. The results showed that the pore structure of Al2O3 could significantly affect the catalyst performance. As the accessible pore diameter of the catalyst increased from 8.0 nm to 9.0 nm, the light aromatics yield increased by 2.7 percentage points, while the operating time of the catalyst nearly doubled. In addition, catalysts prepared with SiO2 and aluminum phosphate was more active and stable than that prepared with Al2O3, of which the light aromatics yield enhanced 6---8 percentage points and the rtm length, or seivice eife run length nearly doubled.

Test Stability of Uster Advanced Fiber Information System(AFIS)

To study test stability of Advanced Fiber Information System(AFIS),card sliver produced in two experiments(12 plans in each experiment)were tested by AFIS.By a statistic analysis of the test results,the number of test times that can get a reliable test reliability(hereinafter this number of test times is referred to as Reliable Test Times,RTT)of test parameters and the coefficient of variation(CV%)values of 30 test results of each experiment plan were obtained.It's concluded that some parameters,such as length,seed coat nep(SCN)size,nep size and immature fiber content(IFC),etc.are very reliable by a test of ten or more times,but other parameters,such as SCN content,trash content,and visible foreign matter(VFM)content,etc.are not reliable until they are tested over 100 times.

Matter-Wave Solitons in Two-Component Bose—Einstein Condensates with Tunable Interactions and Time Varying Potential

We present three families of exact matter-wave soliton solutions for an effective one-dimension twocomponent Bose-Einstein condensates(BECs) with tunable interactions,harmonic potential and gain or loss term. We investigate the dynamics of bright-bright solitons,bright-dark solitons and dark-dark solitons for the time-dependent expulsive harmonic trap potential,periodically modulated harmonic trap potential,and kinklike modulated harmonic trap potential.Through the Feshbach resonance,these dynamics can be realized in experiments by suitable control of time-dependent trap parameters,atomic interactions,and interaction with thermal cloud.

Drug-induced liver injury in hospitalized patients with notably elevated alanine aminotransferase

AIM： To identify the proportion, causes and the nature of drug-induced liver injury （DILI） in patients with no- tably elevated alanine aminotransferase （ALT）. METHODS： All the inpatients with ALT levels above 10 times upper limit of normal range （ULN） were ret- rospectively identified from a computerized clinical laboratory database at our hospital covering a 12-mo period. Relevant clinical information was obtained from medical records. Alternative causes of ALT eleva- tions were examined for each patient, including bili- ary abnormality, viral hepatitis, hemodynamic injury, malignancy, DILI or undetermined and other causes. All suspected DILI cases were causality assessed usingthe Council for International Organizations of Medical Sciences scale, and only the cases classified as highly probable, probable, or possible were diagnosed as DILI. Comments related to the diagnosis of DILI in the medical record and in the discharge letter for each case were also examined to evaluate DILI detection by the treating doctors. RESULTS： A total of 129 cases with ALT 〉 i0 ULN were identified. Hemodynamic injury （n = 46, 35.7%）, DILl （n = 25, 19.4%） and malignancy （n = 21, 16.3%） were the top three causes of liver injury. Peak ALT val- ues were lower in DILI patients than in patients with hemodynamic injury （14.5 5.6 ULN vs 32.5 ：I： 30.7 ULN, P = 0.001）. Among DILI patients, one （4%） case was classified as definite, 19 （76%） cases were clas- sified as probable and 5 （20%） as possible according to the ClOMS scale. A hepatocellular pattern was ob- served in 23 （92%） cases and mixed in 2 （8%）. The extent of severity of liver injury was mild in 21 （84%） patients and moderate in 4 （16%）. Before discharge, 10 （40%） patients were recovered and the other 15 （60%） were improved. The improved patients tended to have a higher peak ALT （808 ＋ 348 U/L vs 623 ＋ 118 U/L, P = 0.016） and shorter treatment duration before discharge （8 ＋ 6 d vs 28 ~ 12 d, P = 0.008） compared with the recovered patients. Twenty-two drugs and 6 herbs were found associated with DILl. Antibacterials were the most common agents causing DILI in 8 （32%） cases, followed by glucocorticoids in 6 （24%） cases. Twenty-four （96%） cases received treatment of DILl with at least one adjunctive drug. Agents for treatment of DILI included anti-inflammatory drugs （e.g., glycyr- rhizinate）, antioxidants （e.g., glutathione, ademetionine 1,4-butanedisulfonate and tiopronin）, polyene phospha- tidyl choline and herbal extracts （e.g., protoporphyrin disodium and silymarin）. Diagnosis of DILl was not mentioned in the discharge letter in 60% of the cases. Relative to prevalent cases and cases from wards of internal medicine, incident cases and cases from surgi- cal wards had a higher risk of missed diagnosis in dis- charge letter [odds ratio （OR） 32.7, 95%CI （2.8-374.1）,CONCLUSION： DILI is mostly caused by use of anti- bacterials and glucocorticoids, and constitutes about one fifth of hospitalized patients with ALT 〉 10 ULN. DILI is underdiagnosed frequently.

Effect of Reclamation Time and Land Use on Soil Properties in Changjiang River Estuary,China

The objective of this study is to analyze soil physical and chemical properties,soil comprehensive functions and impact factors after different years of reclamation.Based on the survey data taken from 216 soil sampling points in the Fengxian Reclamation Area of the Changjiang (Yangtze) River Estuary,China in April 2009 and remotely sensed TM data in 2006,while by virtue of multivariate analysis of variance (MANOVA),geo-statistical analysis (GA),prin-cipal component analysis (PCA) and canonical correspondence analysis (CCA),it was concluded that:1) With the in-crease in reclamation time,soil moisture,soil salinity,soil electric conductivity and soil particle size tended to decline,yet soil organic matter tended to increase.Soil available phosphorous tended to increase in the early reclamation period,yet it tended to decline after about 49 years of reclamation.Soil nitrate nitrogen,soil ammonia nitrogen and pH changed slightly in different reclamation years.Soil physical and chemical properties reached a steady state after about 30 years of reclamation.2) According to the results of PCA analysis,the weighted value (0.97 in total) that represents soil nutrient factors (soil nitrate nitrogen,soil organic matter,soil available phosphorous,soil ammonia nitrogen,pH and soil particle size) were higher than the weighted value (0.48 in total) of soil limiting factors (soil salinity,soil elec-tric conductivity and soil moisture).The higher the F value is,the better the soil quality is.3) Different land use types play different roles in the soil function maturity process,with farmlands providing the best contribution.4) Soil physi-cal and chemical properties in the reclamation area were mainly influenced by reclamation time,and then by land use types.The correlation (0.1905) of the composite index of soil function (F) with reclamation time was greater than that with land use types (-0.1161).

Impact of Rainfall Temporal Heterogeneity on Relationship between Curve Number and Rainfall Depth in the Zagros Mountain Region,Iran

The impact of temporal variation of rainfall on the relationship between rainfall and catchment response is investigated in a catchment with high temporally variable rainfalls and a high percentage of permeable soils in the southwest of Iran.Twenty-nine storm events are classified into two classes, High Temporal heterogeneous(HT) and Low Temporal heterogeneous(LT) events using the variogram technique and the storm events of each class are analyzed to detect the relationship between Curve Number(CN) and rainfall depth. It is found that there is not a similar correlation between CN values and rainfall depths for both temporally variable classes, and hence, two different responses can be observed in the catchment according to rainfall temporal heterogeneities. For HT events, a complacent behavior is detected in which the CNs decline as rainfall depth increases while a different response, violent behavior, is observed for LT events in which the CNs rise and asymptotically approach a constant value with increasing storm size. This considerable difference between CN-P relationships derived from the two temporally variable classes of rainfall is attributed to the provocation of different runoff generation mechanisms, infiltration-excess and saturation-excess caused by rainfall temporal heterogeneities. Moreover, the results support the validity of variogram technique to classify storm events into two LT and HT classes.