Subsidence History of the Eastern Depression in the North Yellow Sea Basin

Using a back-stripping method, our paper simulated the subsidence history of the eastern depression in the North Yellow Sea Basin. The subsidence history curve pattern and the subsidence chorisogram during every subsiding period were exposed. Combining with the regional geologic background and the distribution features of the subsiding centers in every period, a contrasting study of the pattern and the classical subsidence history curves shows the subsidence history is made up of Mesozoic （J3-K1） and Cenozoic （E2-Q） subsiding cycles. The two subsiding cycles are separated by the late Cretaceous and Paleocene （K2-E1） uplift denudation. Both subsiding cycles have the characteristics of an extension basin. The rapid subsidence during the late Jurassic and Eocene is equivalent to the initial subsiding phases in both cycles.. The slow subsidence of both, the early Cretaceous and Neogene, can be regarded as thermal subsidence phases.     

Study of the marine (saltwater) transgression in the palaeo-channels on the south coast plain of Laizhou Bay

The palaeochannels in the studied region are divided into four stages by such methods as 14C dating. Marine (saltwater) transgression in the palaeochannels has been studied as a focal point. Palaeochannels are the main passageway through which the seawater (saltwater) transgresses. The seawater (saltwater) transgresses at a high speed, by many means and in a changeable dynamic state.     

Study on Gold Ore in Permian Organic Reef and Triassic Turbidite in the Juncture of Yunnan-Guizhou-Guangxi provinces,SW China

The sedimentology feature and palaeotectonice system and diagenesis and metallog-netic action were studied after on gold ore in Permian organic reef and Triassic turbidi-te in the juncture of Yunnan-Guizhou-Guangxi Provinces so that the gold ore formcondition were proved and the gold ore orgin model was advanced.That is a strata-boud gold deposit.     

Depositional Characteristics of Deltas and Their Relationship with Hydrocarbon Accumulation in the North Slope, Biyang Depression

1 Introduction Biyang Depression is a dustpan-shaped faul subsidence, with the characteristics of close and mul tiplex provenances and manifold categories of sand stone bodies. Its south part is ruptured while the north one is overlapped. Its clastic sedimentary system is unique, since the reservoir strata are extremely pro lific in the small-sized faulted basin (1000 km2). The fundamental structure style of Biyang Depression belongs to a sealed semi-graben type that is asym metric between s…     

Acoustic emission generated during the gas sorption–desorption process in coal

An experimental system for monitoring the acoustic signals generated in coal during gas sorption and/or desorption was designed and the acoustic signals were observed under different gas pressures. The experimental results show that signals generated by the coal during gas adsorption are attenuated over time. Also, the signals are not continuous but are impulsive. The intensity of the signals generated during gas desorption is far smaller than that observed during adsorption. The signal seen during desorption remains essentially stable. Cycles of sorption and desorption cause acoustic emission signals that exhibit a memory effect, which depends upon the maximum gas pressure the sample was exposed to in earlier cycles. Lower pressures in subsequent cycles, compared to the maximum adsorption pressure in previous cycles, cause both the energy and impulse frequency to be lower than previously. On the contrary, a gas adsorption pressure that exceeds the maximum pressure seen by the sample during earlier cycles causes both the energy and impulse frequency to be high.     

Reservoir space of the Es33–Es41 shale in Dongying sag

The Es₃³–Es₄¹ shales in Dongying sag are source rocks with large reserves of shale oil and gas. For the identification of development characteristics and geological significance of the reservoir space, FMI logging, core observation, thin section analysis, X-ray diffraction, fluorescence microscopy, scanning electron microscopy, mercury porosimetry, low-temperature nitrogen adsorption, atomic force microscopy, and conventional physical property testing were used to study the petrology and reservoir space of the Es₃³–Es₄¹ shale in Dongying sag. The results suggest that the shale is rich in carbonate minerals. Phanerocrystalline stratiform and lamellar argillaceous limestone and calcareous claystone are the oil- and gas-bearing lithofacies. The oil in the micropores is mainly present as membranes and clots. The shale reservoir space has a network structure with veins, carbonate and clay minerals, and micropores among pyrite and the matrix. The results provide the geological framework for future shale oil and gas exploration in Dongying sag.     

Research on Composite Fracturing Technol ogy in Qiaokou Oil fiel d, Dongpu Depression

Limited by serious heterogeneity both horizontally and vertically, water driving of low-permeability layers in Qiaokou oilfield appears to be very difficult. As the class I layer reaches the stage of high water-content too early, the level of exploitation became worse with low-recovery. Regarding the serious heterogeneity and low recovery in layers class Ⅱ and Ⅲ , composite fracturing technology suitable for this kind of reservoir was applied. Its basement was a lab study of indoor water driving efficiency and fracturing experiment. Perfect result has achieved by using the technology.     

Development of a vehicle–track interaction model to predict the vibratory benefits of rail grinding in the time domain

Imperfections in the wheel–rail contact are one of the main sources of generation of railway vibrations. Consequently, it is essential to take expensive corrective maintenance measures, the results of which may be unknown. In order to assess the effectiveness of these measures, this paper develops a vehicle–track interaction model in the time domain of a curved track with presence of rail corrugation on the inner rail. To characterize the behavior of the track, a numerical finite element model is developed using ANSYS software, while the behavior of the vehicle is characterized by a unidirectional model of two masses developed with VAMPIRE PRO software. The overloads obtained with the dynamic model are applied to the numerical model and then, the vibrational response of the track is obtained. Results are validated with real data and used to assess the effectiveness of rail grinding in the reduction of wheel–rail forces and the vibration generation phenomenon.

     

A Study on the Moving Accuracy of the Slide in the Press

ＡＳｔｕｄｙｏｎｔｈｅＭｏｖｉｎｇＡｃｃｕｒａｃｙｏｆｔｈｅＳｌｉｄｅｉｎｔｈｅＰｒｅｓｓ￥（陈维民）（曹喜滨）（刘刚）（高乃光）ＣＨＥＮＷｅｉｍｉｎ；ＣＡＯＸｉｂｉｎ；ＬＩＵＧａｎｇ；ＧＡＯＮａｉｇｕａｎｇ（Ｄｅｐｔ．ｏｆＭａｔｅｒｉａｌＳｃｉｅｎ...     

Expressionism Incarnated in the Dramatic Conflicts in The Glass Menagerie

The Glass Menagerie is the drama for which Tennessee Williams became famous. This article studies on how expressionism is incarnated in the dramatic conflicts. Williams'unique techniques of expressionism make a poetic picture on the stage; present to the audience an ordinary American family immersing in dreams.     

Guest editorial–Special issue on ground control in mining in 2016

正In 1981 a Professor at West Virginia University recognized the need to establish a program for bringing together members of the mining community to share and discuss methods,technology and experiences related to ground control in mining operations[1].From this initial idea the International Conference on Ground     

Guest editorial–Special issue on ground control in mining in 2017

正Ground control is the science of studying and controlling the behavior of rock strata in response to mining operations.Ground control-related research has seen significant advancements over the last 36 years,and these accomplishments are well documented in the proceedings of the annual International Conference on Ground Control in Mining(ICGCM)[1].The ICGCM is a forum to promote closer communication among researchers,consultants,     

Guest editorial–special issue on ground control in mining in 2020

正Ground control is the science of studying and controlling the behavior of rock strata in response to mining operations.Ground-control-related research has seen significant advancements over the last 40 years, and these accomplishments are well documented in the proceedings of the annual International Conference on Ground Control in Mining (ICGCM)[1].     

Temperature distribution in the tool-chip-workpiece system during the orthogonal cutting process

The temperature distribution in the tool, chip and workpiece was studied during the orthogonal cuttingprocess Under several different cutting conditions. The temperature distribution is calculated by the finite differencemethod. and the variation of the material properties with temperature was taken was taken into account The results obtained arecoincident with both previous published results and experimental measurements.     

On the method of the automatic modeling in hydraulic pipe networks

0　INTRODUCTIONWiththedevelopmentofthehydraulicsysteminhighspeedandhighpressure ,thedangercausedbythepres surepulsationwithinthepipebecomesbiggerandbigger ,andthedynamiccharacteristicsanalysisbecomesanindis pensablepartinthehydraulicsystemdesign .Whenthepipe’snaturalfrequencyisthesameortimesasthepres surepulsationfrequencycausedbyworkingelements ,theimpedanceofthepipenetworkapproachesthemaximum ,andcausesresonanceinpipenetworksystem .Thepres surepulsationwithresonanceisafewtimes ,evenafew…     

Magnetic reconnection events in the interplanetary space

Magnetic field and plasma measurements in the period of 1975-1981 with 0. 18-h averages from Helios spacecrafts are analyzed. It is discovered that magnetic reconnection phenomena exist in the interplanetary space. By means of the reconstruction of magnetic field configuration in the azimuth angle plane, it is found that the magnetic reconnection event with time scale of the order of day is a significant form of magnetic reconnection phenomena in the interplanetary space, which consists of a mediate body (or a plasma bulk) and two magnetic separator lines. It could originate from coronal mass ejection event or magnetic cloud in the interplanetary space. Numerical simulation has reproduced the basic characteristics of the magnetic reconnection events.     

Reducing the Power-Loss in RS-485 Designs

Power-loss sometimes needs particular consideration in coal mine. This paper analyzes the main three parts of power consuming of RS-485 system, that is quiescent power consuming, transmission power-consuming and peripheral equipment power consuming. How to reduce the power consuming in RS-485 designs is introduced, and also the method of hardware and software design is presented including choosing low power transceiver, optimizing communication data structure, optimizing communication working mode.     

Ground control monitoring of retreat room–and–pillar mine in Central Appalachia

In order to study pillar and overburden response to retreat mining, a ground control program was conducted at a Central Appalachian Mine. The program consisted of several monitoring methods including a seismic monitoring system, borehole pressure cells in the pillars, and time-lapse photogrammetry of the pillar ribs. Two parallel geophone arrays were installed, one on each side of the panel with the sensors mounted 3 m into the roof. A total of fourteen geophones recorded more than 5000 events during the panel retreat. A MIDAS datalogger was used to record pressure from borehole pressure cells(BPCs)located in two adjacent pillars that were not mined during retreat. A series of photographs were taken of the pillars that had the BPCs as the face approached so that deformation of the entire rib could be monitored using photogrammetry. Results showed that pillar stability and cave development were as expected. The BPCs showed an increase in loading when the face was 115 m inby and a clear onset of the forward abutment at 30 m. The photogrammetry results displayed pillar deformation corresponding to the increased loading. The microseismic monitoring results showed the overburden caving inby the face, again as expected. The significance of these results lies in two points,(1) we can quantify the safe manner in which this mine is conducting retreating operations, and(2) we can use volumetric technologies(photogrammetry and microseismic) to monitor entire volumes of the mine in addition to the traditional point-location geotechnical measurements(BPCs).     

A Researchon the Problems Encountered in the Design of Hypertext Navigation Graph

ＡＲｅｓｅａｒｃｈｏｎｔｈｅＰｒｏｂｌｅｍｓＥｎｃｏｕｎｔｅｒｅｄｉｎｔｈｅＤｅｓｉｇｎｏｆＨｙｐｅｒｔｅｘｔＮａｖｉｇａｔｉｏｎＧｒａｐｈＬＩＵＸｉａｏｄｏｎｇ；ＬＩＬｉａｎｚｈｉ；ＷＡＮＧＹａｎ（刘晓冬，李莲治，王岩）（Ｄｅｐｔ．ｏｆＣｏｍｐｕｔ...