mlsa-iai-msu-lab/ru_sci_bench_zho_cite_reranking huggingface dataset:
Vapor-phase elemental mercury adsorption by residual carbon separated from fly ash

The adsorption capacity for vapor-phase elemental mercury(Hg0 ) of residual carbon separated from fly ash was studied in an attempt for the control of elemental mercury emissions from combustion processes. At Iow mercury concentrations ( ＜ 200 μg/m3),unburned carbon had higher adsorption capacity than commercial activated carbon. The adsorbality of unburned carbon was also found to be source dependent. Isotherms of FS carbon(separated from fly ash of a power plant of Shishi in Fujian Province) were similar to those classified as type Ⅱ. Isotherms of XJ carbon (separated from fly ash of a power plant of Jingcheng in Shanxi Province) were more like those classified as type Ⅲ. Due to the relatively Iow production costs, these residual carbons would likely be considerably more costeffective for the full-scale removal of mercury from combustion flue gases than other technology.
Groundwater remediation engineering--Study on the flow distribution of air sparging using acetylene

Air sparging(AS) is an emerging method to remove VOCs from saturated soils and groundwater. Air sparging performance highly depends on the air distribution resulting in the aquifer. In order to study gas flow characterization, a two-dimensional experimental chamber was designed and installed. In addition, the method by using acetylene as the tracer to directly image the gas distribution results of AS process has been put forward. Experiments were performed with different injected gas flow rates. The gas flow patterns were found to depend significantly on the injected gas flow rate, and the characterization of gas flow distributions in porous media was very different from the acetylene tracing study. Lower and higher gas flow rates generally yield more irregular in shape and less effective gas distributions.
子宫内膜透明细胞癌致子宫坏死并腹腔感染及结肠广泛坏死1例

我们收治了1例以不明原因闭经为首发症状,伴子宫坏死、腹腔感染、结肠广泛坏死的年轻子宫内膜透明细胞癌患者,比较罕见,现报告如下.
Microbial activity related to N cycling in the rhizosphere of maize stressed by heavy metals

A greenhouse experiment was carried out to compare differences in potential activities of ammonification, nitrification and denitrification in rhizosphere and bulk soil in a heavy-metal-stressed system. Exchangeable fractions of Cd, Cu and Cr were all higher in the rhizosphere of maize than in bulk soil. Results showed that the mineralization of N in soil was stimulated by low concentration of Cd.Addition of Cd at low levels stimulated the ammonifying and nitrifying activity in soil, while inhibitory influences were shown at high levels.Nitrifying bacteria was proved to be the most sensitive one, whilst the effect on denitrifying bacteria was very limited. Comparing Cd, Cu and Cr(Ⅵ) at 20 mg/kg soil, Cd was the most effective inhibitor of ammonification and denitrification, while Cr(Ⅵ) had the strongest inhibitory influence on nitrifying activity. Root exudates played important roles on the different exchangeable metal fractions and bacterial activities between rhizosphere and non-rhizosphere. Nitrate was the main form of mineral N in soil, as well as the main form of N absorbed by plants, but the formation and relative absorption of ammonium were promoted in response to high Cd exposure.
Screening of flocculant-producing strains by NTG mutagenesis

Screening of new microorganism being able to produce efficiently flocculants was carried out. A new model for screening efficient flocculant-producing strains was designed and tested. The results showed that this model for screening efficient flocculant-producing strains is very reliable and can greatly shorten the screening period. 13 flocculant-producing strains were isolated from activated sludge by conventional method. A strain, designated as HHE6, produced the bioflocculant with the turbidity removal 98% for kaolin suspension. Six of 13 strains selected as the original strains were treated with NTG as mutagen, and five mutant strains(HHE-P7, HHE-A8, HHE-P21,HHE-P24, HHE-A26) with high flocculation efficiency was obtained by selection, which exhibited the flocculation rate for kaolin suspension above 90%. Strains HHE6, HHE-P7, and HHE-P24 were classified as Penicillium purpurogenum, HHE-P21 as Penicillium cyclopium,HHE-A26 as Aspergillus versicolor and HHE-A8 as Aspergillus fumigatus, and it is hitherto unreported for biofloccutant-producing strains of Penicillium. The growth of the six strains(HHE6, HHE-P7, HHE-A8, HHE-P21, HHE-P24, HHE-A26) had similar curves, i.e. firstly increasing rapidly, keeping relatively constant then and finally decreasing gradually with cultivation time. The production of bioflocculants by strains showed the similar pattern to strain growth.
Sonocatalytic degradation of methyl orange in the presence of (nanometer and ordinary) anatase TiO2 powders

The nanometer and ordinary anatase titanium dioxide(TiO2 ) powders were adopted as the sonocatalysts for the degradation of methyl orange used as a model compound for the first time. It was found that the sonocatalytic degradation effect of methyl orange in the presence of TiO2 powder were much better than that without TiO2, but the sonocatalytic activity of the nanometer anatase TiO2 particle was obviously higher than that of ordinary anatase TiO2 particle. Although there are many factors influencing sonocatalytic degradation of methyl orange, the experimental results showed that the best degradation ratio of methyl orange could be obtained when the experimental conditions were: initial concentration 15 mg/L, nanometer anatase TiO2 adding amount 750 mg/L, ultrasonic frequency 40 kHz, output power 50 W, pH = 3.0 and temperature 40℃ within 150 min. In addition, the catalytic activity of reused nanometer anatase TiO2 catalyst was also studied and found to decline gradually comparing with initial nanometer anatase TiO2 catalyst. All experiments indicated that the method of the sonocatalytic degradation of organic pollutants in the presence of TiO2 powder was an advisable choice for non- or lowtransparent organic wastewaters.
Degradation of H-acid in aqueous solution by microwave assisted wet air oxidation using Ni-loaded GAC as catalyst

A novel process, microwave assisted catalytic wet air oxidation(MW-CWO), was applied for the degradation of H-acid( 1-amino8-naphthol-3, 6-disulfonic acid) in aqueous solution. Ni-loaded granular activated carbon (GAG), prepared by immersion-calcination method, was used as catalyst. The results showed that the MW-CWO process was very effective for the degradation of H-acid in aqueous solution under atmospheric pressure with 87.4% TOC (total organic carbon) reduction in 20 min. Ni on GAC existed in the form of NiO as specified by XRD. Loss of Ni was significant in the initial stage, and then remained almost constant after 20 min reaction. BET surface area results showed that the surface property of GAC after MW-CWO process was superior to that of blank GAC.
双侧输卵管同时妊娠破裂1例

患者29岁,住院号10105.因停经50d,剧烈腹痛1d于2004年10月30日入院.该患既往月经规律,婚后4年未孕.末次月经2004年9月10日.10月29日上午下腹剧痛,逐渐延至全腹,门诊以"异位妊娠"诊断收入院.查体:体温36.4℃,脉搏80/min,呼吸20/min,血压90/50mmHg(1mmHg=0.133kPa);无贫血貌,心肺正常,腹肌紧张,下腹部有压痛及反跳痛,移动性浊音阳性.……
加强急救应急体系建设提供2008奥帆赛急救保障

近年来,青岛市政府加强了急救应急体系建设、紧急救援中心的建设,提高了青岛应对突发事件的快速反应能力,也为迎接2008奥运会帆船比赛奠定了良好基础.
乘机旅客死亡28例临床分析

目的 探讨乘机旅客的适航性和急症特点,以提高危重患者的救治成功率.方法 回顾性分析1996-01～2004-01在北京首都国际机场候机楼和飞机上急救的28例死亡乘客的临床资料.结果 28例院前死亡患者在医护人员赶到现场时,呼吸和心跳均已停止10min以上,虽现场抢救30～60min,但无一例复苏成功.结论 乘机心跳骤停患者抢救成功与否与急救反应时间、到现场时间、开始抢救时间及患者原发病是否可逆等因素密切相关.
早期机械通气对严重颅脑创伤患者颅内压和脑代谢的影响

目的观察早期机械通气及开颅探查术对严重颅脑创伤患者颅内压(ICP)、脑灌注压(CPP)、颈内静脉血氧饱和度(SjvO2)及动脉-颈内静脉血乳酸浓度之差(VADL)的影响.方法重型颅脑损伤患者21例,入院后给予早期机械通气治疗,并在明确诊断后1 h内行开颅探查颅内血肿清除+去骨瓣减压术.分别于气管插管机械通气前、通气后10 min、通气后30min、开颅前、开颅后5个时相点通过侧脑室置管监测ICP,计算CPP;同时分别抽取动脉、颈内静脉血行血气分析及乳酸测定.结果与机械通气前相比,机械通气后10 min ICP显著降低(P＜0.05),CPP显著升高(P＜0.05),SjvO2、VADL无显著变化.机械通气后30 min和开颅前ICP、VADL显著升高(P＜0.01和P＜0.05),CPP、SjvO2显著降低(P＜0.05),开颅后ICP、VADL较开颅前显著下降(P＜0.01和P＜0.005),CPP、SjvO2显著升高(P＜0.01).结论长时间机械通气治疗不能降低重型颅脑损伤患者ICP、改善脑代谢;及时行开颅探查颅内血肿清除术是降低ICP、改善脑代谢的有效方法.
胶囊内镜对小肠疾病的诊断价值

以往小肠疾病的检查主要依靠小肠钡剂造影、小肠镜、数字减影血管造影、腹部CT等,且只能对部分病因作出诊断.胶囊内镜问世及在临床上的推广应用,填补了小肠缺乏可视性检查的空白,使小肠疾病的诊断获得了突破性的进展.……
无痛苦消化内镜技术临床应用现况

无痛苦消化内镜检查也称清醒镇静内镜检查术(conseious sedation endoscopy)是指应用一种或多种药物抑制患者的中枢神经系统,减轻患者的恐惧及焦虑心理,提高痛阈,保持一定程度神智清醒,轻度意识丧失,有完整吞咽、咳嗽等保护性反射,无任何痛苦的情况下,保证内镜检查和治疗顺利完成.……
类脂质沉积病的眼部表现

郭××女 15岁以双眼视力逐渐下降已2年于2004年8月9日就诊我院眼科.患者自幼(5～6岁)开始,手抽搐,面部肌肉抽搐,全身抽搐,肢体不自主抖动,行走不稳,有时情绪激动时不能行走.意识清.家族无同样病史.视力:右0.12,矫正视力0.3,左眼0.25,不能矫正.……
严重眼内炎的手术治疗

眼内炎是一种损坏严重的眼内感染,可导致视力丧失.通常认为眼内炎视功能无光感时失去了手术治疗的价值.但随着眼科显微外科手术的发展,使部分无光感眼内炎患者有恢复视力的可能,最近对4例严重眼内炎无光感患者行玻璃体视网膜手术,均获得了部分视力.……
无化学试剂离子色谱法测定液体食物中安息香酸盐

我们通常在很多食品中,如苏打饮料、果汁、酱油、果酱和果冻等,添加一些防腐剂防止食品变质.由于安息香酸盐具有低毒无味的特点和抗菌能力,从二十世纪早期开始,就作为防腐剂在世界范围内广泛应用.安息香酸盐在酸性环境下效果更好(pH≤4.5),所以一般情况下不推荐在高pH条件下使用.……
潮滩沉积物中重金属污染物的感耦等离子体原子发射光谱分析

潮滩中积累的重金属污染物,不仅使滩地环境面临恶化的趋势,而且在遇到灾害性天气和风浪的情况下,潮滩沉积物里的重金属污染物可能再次释放出来,形成突发性的环境污染.潮滩及河口重金属污染的研究越来越多地被人们重视.我们选择对环境生态相对具有较大影响的银、铝、砷、镉、铬、铜、铁、汞、锰、铅和锌等十一种元素,利用原子发射光谱对它们在潮滩沉积物中的含量进行了分析,并与在附近地域38米深处获得的样品所含有的相同元素相比较,获得了令人满意的结果.……
高压氧治疗进展

随着科学技术的进步以及诊疗方法的改进,脑损伤的死亡率、病残率已有明显的降低,但仍有部分病人后遗终身的残疾,生活不能自理,给社会、家庭造成巨大的经济负担和精神压力[1].
同一类型对称性可生成不同类型守恒量--分析力学札记之十三

将对称性分为Noether对称性、Lie对称性和形式不变性等3种类型,将守恒量分为Noether守恒量、Hojman守恒量和新型守恒量等3种类型.研究Lagrange系统同一类型对称性生成不同类型守恒量的问题.
新型数控铣床用磁悬浮高速电主轴的设计分析

与其它支承形式的电主轴相比,磁悬浮电主轴更易于实现高速化.文章介绍了一种新型数控铣床用磁悬浮高速电主轴的基本结构、控制原理等,并对其轴系的转子动力学特性进行了初步分析.
超声诊断右心室流出道黏液瘤1例

患者男,22岁.半年前无诱因出现活动后气短,症状逐渐加重,2个月前上楼梯时突然晕倒,无意识障碍.查体:胸骨左缘肺动脉瓣区可闻及3级收缩期杂音.超声心动图显示:右房大小50 mm×48 mm,右室大小39 mm×41 mm,于右室流出道至肺动脉瓣口可见不规则形中等偏高团状回声,大小约41 mm×28 mm,并可见细带样蒂附着于肺动脉瓣下方室间隔处,瘤体可随心脏舒缩而活动,收缩期突入肺动脉内(图1),造成肺动脉瓣口相对狭窄,瓣口血流明显加快,瓣口流速约3.8 m/s,压差6.4kPa,舒张期回纳入肺动脉瓣下方,三尖瓣口收缩期可见轻度反流,约为9 ml.超声诊断:右室流出道黏液瘤,三尖瓣轻度反流.……
超声诊断节育器游离至膀胱合并结石1例

患者女,34岁.因间断性腹痛、尿频1年,加重伴血尿2 d就诊.查体:一般情况好,心肺未见异常,下腹部压痛,无反跳痛及腹肌紧张,未触及明显包块.妇科检查:子宫平位较软,活动度好,无压痛,双附件区未触及异常.……
乳腺腔镜手术的进展及存在问题

20世纪后期临床外科学的重大进步之一是微创外科理论逐渐成熟和作为微创外科重要标志的腔镜手术的迅速发展.乳腺腔镜手术经过十余年的探索和发展,以其特有的治疗效果和美容优势,正在改变着外科医生的传统治疗理念,作为乳腺外科新的、重要的治疗手段,显示出强大的生命力和广泛的应用前景.
拟康氏木霉和枯草芽孢杆菌对黄瓜枯萎病的协同防治作用

黄瓜枯萎病是一种危害严重的土传病害,目前对黄瓜枯萎病的防治主要为化学法,但化学农药防治效果不佳,且易造成环境污染、农药残留等问题.利用拮抗菌防治黄瓜枯萎病日益受到国内外的重视[1,2],但单独用细菌或真菌防治黄瓜枯萎病防效低且不够稳定.用拮抗细菌和拮抗真菌联合防治植物病害是生物防治的一个新趋势.……
低浓度BaCl2对假二元微乳液临界行为的影响

20年来,流体临界现象的研究在实验和理论上取得了可喜的进展.近几年,流体临界现象的研究扩展到胶束溶液和微乳液体系[1,2].本文前期工作研究了假二元微乳液(水/丁二酸二辛酯磺酸钠(AOT)/正构烷烃)体系[3～5]临界现象,发现该微乳液体系在临界点附近符合3D Ising理论.Martin等[6,7]研究了盐对二元胶束体系临界现象的影响,结果表明:一价盐对胶束溶液的临界指数没有影响,符合3D Ising模型;三价盐对胶束溶液的临界指数有明显影响,符合Fisher重整化理论.……
Magnetic susceptibility variations of the Ediacaran cap carbonates in the Yangtze platform and their implications for paleoclimate

Magnetic susceptibility (MS) data were obtained from 11 sections of the Doushantuo (Ediacaran) cap carbonate that directly overlies the Nantuo glacial diamictite in the southeastern margin of the Yangtze platform. The MS data revealed two regionally correlatable peaks at the bottom and top of the cap carbonate, separated by an interval of low values. The lower MS peak coincides with high percentage of insoluble siliciclastic residues that are compositionally identical to the matrix of the underlying diamictite, suggesting its origin controlled mainly by detrital components during the first phase of cap carbonate deposition at the end of the glaciation. The upper MS peak is associated with high clay content and iron sulfides, and can be interpreted as either derived from enhanced greenhouse weathering that could have brought more terrigenous components into the ocean, or the result of ocean anoxia at the late stage of cap carbonate deposition that could led to formation of abundant iron sulfides. The regionally consistent MS curves from the cap carbonates provided the first geophysical record for the rapid climate change from icehouse to greenhouse conditions in the aftermath of the Neoproterozoic “snowball Earth” event.
盐酸纳洛酮抢救安坦中毒一例

患者女，43岁。因患抑郁症曾于2004年3月住我院治疗。2004年9月11日晚9时许，患者自行一次顿服安坦50余片（约100mg）、普萘洛尔90余片（约900mg）、劳拉西泮40余片（约20mg）、阿普唑仑40余片（约16mg）11h后被送来我院急诊。入院检查：体温39℃，心率90次／min，呼吸14次／min，血压120／80mm Hg（1mmHg=0．133kPa）；
Kleine—Levin综合征

Kleine早在1925年首先描述了Kleine—Levin综合征（Kleine—Levin Syndrome，KLS）：复发性嗜睡、行为障碍（暴食和无节制的性冲动）、精神障碍；随后Levin在1929年肯定了他的描述。Critchley等则在1942年首次应用KLS命名病例，并指出KLS具有以下特点：复发性嗜睡、强迫性进食、易激惹／焦虑、性冲动增加，男性多见，多于青少年期起病。KLS是一种非常罕见的疾病，经Pre—MEDLINE和MEDLINE检索，截止到2005年6月2日，仅有177篇KLS相关研究，且以个案报告为主。资料的匮乏使大多数医生难以识别。
我国稀土永磁行业发展面临的主要问题及建议

我国稀土永磁行业在短短半个世纪的发展历程中,取得了令世人瞩目的非凡成就,不可说不是全球磁材行业变革的一大奇迹.但需要注意的是,伴随飞速发展的同时,我国永磁行业发展面临着七大严峻问题,影响着我国稀土永磁业的进一步发展.正是基于这点考虑,本文指出我国永磁行业发展面临的主要问题,并为永磁企业的发展提出两点建议--产业整合和在市场与技术开发上争取主动.
黄连素的临床应用进展

目的:综述黄连素的临床应用进展状况,指导临床用药.方法:对国内有关黄连素的临床应用文献报道进行总结.结果:黄连素对治疗心血管疾病、胃病、妇科疾病等具有实用性价值.结论:黄连素治疗心血管、消化道、糖尿病等疾病的方法值得推广.
何首乌提取物对人脐静脉内皮细胞株ECV-304的VCAM-1、ICAM-1表达的影响

内皮细胞是血液与血管壁之间的结构和功能屏障,内皮细胞受损是动脉粥样硬化(AS)形成的始发因素,粘附分子在内皮细胞受损过程中起了重要作用,因此如何控制内皮细胞粘附分子的表达在防止AS发生中是至关重要的.中药何首乌临床证实其提取物对生物体多种代谢活性具有积极的影响作用[1～4],但对内皮细胞粘附分子的表达是否有影响,还未见文献报道.本文用何首乌提取物作用内皮细胞后检测血管内皮细胞粘附分子-1(VCAM-1)和细胞间粘附分子-1(ICAM-1)表达的变化,阐明何首乌对内皮细胞粘附分子的表达是否有作用,为临床上用中药防治AS提供理论依据.
Virtual Photon Effects on Chaos in Generalized Lorenz-Haken Equation

The dynamics of an ensemble of two-level atoms injected into a single-mode cavity is studied in the exact atom-field interaction situation, in which the counter-rotating terms describing the so-called virtual photon processes neglected in the rotating-wave approximation, are considered. The cavity mode is driven by the injected classical field, and the atom is prepared in a coherent superposition of the two levels. We first derive the generalized Lorenz-Haken equation by using the technique of quantum Langevin equation, and then numerically study the dynamics of this equation. We find that the virtual photon processes have strong effects on the dynamics, which can cause the trajectory in phase space of strange attractor spiral around four focus points, and the trajectory is modulated by virtual photon processes. The chaos region in parameter space is now enlarged. It should be stressed that the strange attractor can exist in optical bistability, and whether the atomic coherences and classical field can inhibit chaos depends on the laser frequency.
Reliability Analysis of Partially Repairable Systems

The reliability analysis of a system with repairable failures and non-repairable failures is presented. It is assumed that the system has n repairable failure modes and m non-repairable failure modes. As one repairable failure mode takes place, the system will be repaired after the failure mode is detected, otherwise, it would never work again when attaining one non-repairable failure mode. Thus, the system brings about new reliability indices for having both repairable failures and non-repairable failures. The definitions of the new reliability indices are given, and the calculating methods for them are derived by using probability analysis and the supplementary variable technique.
Hojman Conservation Laws for Relativistic Birkhoffian System

For a relativistic Birkhoffian system, the Lie symmetry and Hojman conserved quantity are given under infinitesimal transformations. On the basis of the invariance of relativistic Birkhoffian equations under infinitesimal transformations, Lie symmetrical transformations of the system are constructed, which only depend on the Birkhoffian variables. The determining equations of Lie symmetry are given, and a Hojman conserved quantity is directly obtained from Lie symmetry of the system. An example is given to illustrate the application of the results.
Matrix Approximation with Constraints of Matrix Inequalities and Applications in Robust Control

This paper deals with a general class of optimization problems in robust control with given expectation value of performance index, which can be transformed into the problem of matrix approximation with matrix inequalities constraints. Theorem for existence and the uniqueness of the solutions of matrix approximation with linear matrix inequalities (LMIs) constraints is presented and algorithms for solving the problems of matrix approximation with matrix inequalities constraints are given based on the fact that such problems can be converted into the generalized eigenvalue problem (GEVP) of LMI. Examples are given to illustrate the main results of the paper.
紫球藻的培养与多不饱和脂肪酸合成的研究进展

综述各种主要培养基、有机和无机碳氮源、磷源、维生素、O2等营养因子;温度、光照、特殊光源、pH值、盐度等环境物理因子;接种量、抗生素等其它因子对紫球藻生长及多不饱和脂肪酸合成的影响,特别提及不同生长时期和半连续培养方式等其它时空因素对该藻合成AA和EPA的促进或抑制效果。此外,介绍了以计算机在线控制和高自动化为主导的新型紫球藻光生物反应器的研制进展、分离纯化该藻AA和EPA的不同方法,并对未来的研究思路提出了设想,指出利用正交及优化实验等科学手段获取紫球藻培养及生产AA和EPA的最佳条件、设计更大规模和更高自动化控制程度的反应器以及发展新型高效分离提纯技术手段是未来研究的趋势。
毓麟珠加减治疗女性性功能障碍举隅

毓麟珠方出自<景岳全书*妇人规>,由人参、白术、茯苓、芍药、川芎、甘草、当归、熟地黄、菟丝子、杜仲、鹿角霜、川椒组成.笔者运用该方治疗排卵障碍[1] 时,偶然发现该方对女性性功能障碍有显著疗效.后以此方加减治愈女性性功能障碍计五百余例,疗效满意.聊举一隅,以飨同道.
杂交玉米新品种筛选试验初报

杂交玉米是毕节市种植推广的主要品种,2004年毕节市在扩大杂交玉米种植时,结合毕节地区玉米百万亩粮食增产工程项目的实施,积极引进新品种进行试验示范,探索新品种的丰产性、适应性、抗性等,选择适宜毕节市种植的最佳玉米新品种.
青少年陈旧性经舟骨月骨周围骨折脱位的手术治疗

经舟骨月骨周围骨折脱位是一种诊治较困难的损伤,常因误诊而延误治疗,成为陈旧性损伤.1996年5月-2004年11月我科共收治经舟骨月骨周围骨折脱位青年患者22例,经手术治疗后随访3个月～8年,效果满意.……
掌背动脉为蒂的两种岛状皮瓣的临床应用

手部损伤在临床中较为常见,对于伴有骨、肌腱等组织裸露的创面需要以皮瓣修复.2000年9月-2004年4月,我们采用掌背动脉为蒂的2种岛状皮瓣,急诊一期修复28例的手部创面,皮瓣全部存活,效果满意.……
Comparison of Soil Biota Between Organic and Conventional Agroecosystems in Oregon, USA

Soil samples at 0-10 cm in depth were collected periodically at paired fields in Corvallis, Oregon, USA to compare differences in soil microbial and faunal populations between organic and conventional agroecosystems. Results showed that the organic soil ecosystem had a significantly higher (P ＜ 0.05) average number or biomass of soil bacteria; densities of flagellates, amoebae of protozoa; some nematodes, such as microbivorous and predaceous nematodes and plant-parasitic nematodes; as well as Collembola. Greater numbers of Rhabditida (such as Rhabditis spp.), were present in the organic soil ecosystem while Panagrolaimus spp. were predominant in the conventional soil ecosystem. The omnivores and predators of Acarina in the Mesostigmata (such as Digamasellidae and Laelapid), and Prostigmata (such as Alicorhaiidae and Rhagidiidae), were also more abundant in the organic soil ecosystem. However, fungivorous Prostigmata (such as Terpnacaridae and Nanorchestidae) and Astigmata (such as Acarida) were significantly higher (P ＜ 0.05) in the conventional soil ecosystem, which supported the finding that total fungal biomass was greater in the conventional soil ecosystem. Seansonal variations of the population depended mostly on soil moisture condition and food web relationship.The population declined from May to October for both agroecosystems. However, higher diversities and densities of soil biota survived occurred in the organic soil ecosystem in the dry season.
Pedogenic and Anthropogenic Influence on Calcium and Magnesium Behaviors in Stagnic Anthrosols

The formation of Stagnic Anthrosols is closely related to rice planting and parent materials. Six representative pedons,two from each of three Stagnic Anthrosol subgroups, Vertic Haplic-, Vertic Gleyic-, and Sulfic Gleyic-Stagnic Anthrosols,from different parent materials and soil formation processes, from Liaoning Province, China, were selected and used along with additional supporting data to assess the potential impact in each soil subgroup combination of both pedogenic and anthropogenic factors on the migration and geochemical characteristics of calcium (Ca) and magnesium (Mg) and their relations to soil particle-size composition. Results revealed that exchangeable Mg was correlated positively with clay and silt content, but negatively with sand content, suggesting that clay and silt could retain more exchangeable Mg than sand. Also, in the six pedons exchangeable Ca/Mg ratios generally decreased with depth, which was most likely due to the preferential retention of Mg below the Ap1 horizon and the effects of bio-cycling in rice-soil systems. The pedons with high pH had smaller exchangeable Ca/Mg ratios than those with low pH. Thus, it was concluded that exchangeable Ca/Mg ratios could be helpful in classification of Stagnic Anthrosols.
Spatial and Temporal Variability of N, P and K Balances for Agroecosystems in China

Nitrogen, phosphorus, and potassium balances for agroecosystems in China from 1993 to 2001 were calculated at national and provincial levels using statistical data and related parameters, and their spatial and temporal variabilities were analyzed with GIS to estimate the potential impacts of nutrient N, P and K surpluses or deficits to soil, water and air. At the national scale, the N and P balances from 1993 to 2001 showed a surplus, with the nitrogen surplus remaining relatively stable from 1997-2001. Although during this period the P surplus pattern was similar to N, it had smaller values and kept increasing as the use of phosphate fertilizer increased year by year. However, K was deficient from 1993 to 2001 even though from 1999 to 2001 the K deficit decreased. The spatial analysis revealed higher N surpluses in the more developed southeastern provinces and lowest in the western and northern provinces where there was less chemical fertilizer input. The serious K deficit mainly occurred in Shanghai and Beijing municipalities, Jiangsu, Zhejiang and Hubei provinces, and Xinjiang autonomous regions. For the years 1992, 1996 and 2001, N surpluses and K deficits had significant positive spatial correlations with per capita gross domestic product (GDP), per capita gross industrial output value, and per capita net income of rural households. This showed that the level of economic development played an important role on nutrient balances in the agroecosystems.
Effect of Organic Acids and Protons on Release of Non-Exchangeable NH4+ in Flooded Paddy Soils

In a model experiment, which imitated the rhizosphere of rice, the effect of organic acids (oxalic acid, citric acid) and protons on the release of non-exchangeable NH4+ and the resin adsorption of N was studied in a paddy soil, typical for Zhejiang Province, China. Oxalic and citric acids under low pH conditions, in combination with proton secretion, favored the mobilization of NH4+ ions and increased resin adsorption of N. The release of non-exchangeable NH4+ was associated with less formation of iron oxides. These could coat clay minerals and thus hinder the diffusion of NH4+ ions out of the interlayer. Protons enhanced the release of NH4+, and then they could enter the wedge zones of the clay minerals and displace non-exchangeable NH4+ ions.
Residual Levels and New Inputs of Chlorinated POPs in Agricultural Soils from Taihu Lake Region

Selected persistent organochlorine pesticides (OCPs), including 1,1,1-trichloro-2,2-bis(p-chlorophenyl)ethane (DDT)and its principal metabolites 1,1-dichloro-2,2-bis(p-chlorophenyl)ethylene (DDE) and 1,1-dichloro-2,2-bis(p-chlorophenyl)ethane (DDD), hexachlorocyclohexane (HCH) and its isomers (α-, β-, γ-, and δ-HCH), hexachlorobenzene (HCB), endosulfan, dieldrin, and endrin were quantified to determine current levels of organochlorine pesticides, to assess the ecotoxicological potential, and to distinguish previous and current inputs in agricultural soils from the Taihu Lake region.Gas chromatography equipped with a 63Ni electron-capture detector (GC-ECD) system was employed. Thirteen OCPs were detectable in all soil samples, with DDTs being the main residues, and HCHs had the second highest level of OCP residues. Although OCP residual levels were lower than those in 1990s, the residual levels for most of the DDTs and some of HCHs were still higher than the national environmental standards for agricultural soils. The ratios of DDT/DDE and γ-/α-HCH in twelve soils indicated that new inputs could be present in the soils. Thus, efforts should be made to completely ban the production of OCPs and their use in agriculture so as to reduce the threat of OCPs to food quality and human health.
石油科技期刊的榜样

>《石油地球物理勘探》编辑部:在贵刊创刊40年之际,胜利油田的《油气地球物理》编辑部谨送上最深切的祝福和最热烈的祝贺!贵刊在胜利油田拥有众多的新读者和老刊迷,也有许多年轻的和专家级的作者,因此她在胜利油田勘探开发中发挥的作用有口皆碑,为推动油田物探技术的发展做出了重要贡献。
《石油地球物理勘探》创刊40年随感

今年是《石油地球物理勘探》创刊40年。就在她诞生的那一年,我走出校门,踏上了石油物探的人生之路,一干就是一辈子。40年间,《石油地球物理勘探》一直和我们几代石油物探工作者依依相伴。我们把她视为良师益友,有时也对她倾注爱心和期盼。我还清楚地记得,刚刚参加地震队工作的那几年,每年都分来一批新毕业的学生。他们踌躇满志、满怀激情,在踏踏实实地参加各种生产实际锻炼的同时,人人都想在工作上做出点成绩,以展示自己的才华。
全国冷暖变化显著部分地区发生雪灾--2004年12月

12月份,全国大部地区降水接近常年同期或偏多,广东、海南部分地区降水偏少,旱情持续.下旬,中东部出现大范围雨雪天气过程,湘、赣、浙等地出现雪灾.全国大部地区气温偏高,但月内气温起伏变化大,广西、贵州等地遭受冰(霜)冻危害.
全国大部气温起伏大南方雨雪纷飞冻害多--2004年12月

12月,全国大部地区降水偏多或接近常年同期,但广东、海南部分地区降水偏少,旱情持续.下旬,中东部出现大范围雨雪天气过程,湖南、江西、浙江等地出现雪灾.月内全国大部地区气温偏高,但气温起伏变化大,江南和华南的部分地区遭受冰(霜)冻危害.