Cross Assembler Research Articles

Data-mining based assembly of promising metal-organic frameworks on Xe/Kr separation

The adsorptive separation of xenon (Xe) and krypton (Kr) becomes increasingly important for the treatment of used nuclear fuel (UNF), and thus the novel high-performing metal–organic frameworks (MOFs) on Xe/Kr adsorption separation are urgently needed. In this work, the 200 MOFs formally used for ethane/ethylene separation were adapted to construct structure-adsorption property relationships (SAPR) for Xe/Kr mixture (20/80 v/v) at 298 K and 1 bar, to screen for MOFs with large Xe/Kr selectivities and Xe uptakes in the CoRE MOF, G-MOFs and hMOFs databases with more than 320,000 structures. Then based on the screened 1499 MOFs, the important metal nodes and organic linkers of MOFs (genes) governing the Xe uptake were identified by data-mining of feature engineering, which were assembled crossly into three novel promising MOFs according to material genomics strategy. After considering of the regenerabilities, it is found that Xe uptake (4.2857 mmol/g) and Xe/Kr selectivity (19.70) of the assembled Al2O6-fum_B-hmof8_No1 are larger than those of the most of experimentally synthesized frameworks including Al-Fum-Me, overcoming the “trade-off” problem between adsorption selectivity and capacity. From the multiscale calculations at GCMC and DFT levels, it is found that the large 1D pore size that can accommodate a double-atom chain and large electrostatic potential gradient (EPG) should be responsible for the high Xe uptake and Xe/Kr selectivity of Al2O6-fum_B-hmof8_No1, respectively. Note that the present work first report double-atom chain of rare gas adsorbed in MOF materials. The present data mining and cross assembly strategies are expected to assist the discovery of novel high-performing MOF absorbents for the separation of Xe-Kr even light hydrocarbon in the future.

Mechanical performance of sustainable modular prefabricated composite shear panels under cyclic loading

This study focuses on the seismic pxerformance of a new sustainable modular prefabrication composite shear panel (MPCSP) system. 1:3 scaled MPCSP specimens with vertial, horizontal and cross assembly ways of the modulars are investigated experimentally under quasi-static loading. Finite element(FE) model is validated with the experimental data and then numerical analyses of 44 computional cases with different parameters of the vertical assembled MPCSP system are conducted for systematic discussion on mechanical characteristics of the investigated models. It shows that the new sustainable prefabrication system is of excellent seismic performance, especially for the vertical assembled MPCSP system(MPCSP-V). Numerical analysis and tests coincide reasonably well with each other. The best seismic performance is achieved at an aspect ratio of 1 for the MPCSP-V system. Design parameters, such as height-thickness ratio of steel plate and bolt distance, have significant influence on the mechanical performance of the system. The effect of the distance of bolts, the spacing between concrete cover plates (RCCPs) and connection steel plates (CSPs), and the thickness of CSP are more significant on the mechanical properties of MPCSP system, while the effect of the bolt layout and the thickness of RCCP are shown to be less significant. The proposed formulas of three-line constitutive law and shearing capacity can well capture key performance index of shear resistance and stiffness at yield, peak and ultimate points.

Null Exciton Splitting in Chromophoric Greek Cross (+) Aggregate

AbstractExciton interactions in molecular aggregates play a crucial role in tailoring the optical behaviour of π‐conjugated materials. Though vital for optoelectronic applications, ideal Greek cross‐dipole (α=90°) stacking of chromophores remains elusive. We report a novel Greek cross (+) assembly of 1,7‐dibromoperylene‐3,4,9,10‐tetracarboxylic tetrabutylester (PTE‐Br2) which exhibits null exciton coupling mediated monomer‐like optical characteristics in the crystalline state. In contrast, nonzero exciton coupling in X‐type (α=70.2°, PTE‐Br0) and J‐type (α=0°, θ=48.4°, PTE‐Br4) assemblies have perturbed optical properties. Additionally, the semi‐classical Marcus theory of charge‐transfer rates predicts a selective hole transport phenomenon in the orthogonally stacked PTE‐Br2. Precise rotation angle dependent optoelectronic properties in crystalline PTE‐Br2 can have consequences in the rational design of novel π‐conjugated materials for photonic and molecular electronic applications.

Null Exciton Splitting in Chromophoric Greek Cross (+) Aggregate

Exciton interactions in molecular aggregates play a crucial role in tailoring the optical behaviour of π-conjugated materials. Though vital for optoelectronic applications, ideal Greek cross-dipole (α=90°) stacking of chromophores remains elusive. We report a novel Greek cross (+) assembly of 1,7-dibromoperylene-3,4,9,10-tetracarboxylic tetrabutylester (PTE-Br2 ) which exhibits null exciton coupling mediated monomer-like optical characteristics in the crystalline state. In contrast, nonzero exciton coupling in X-type (α=70.2°, PTE-Br0 ) and J-type (α=0°, θ=48.4°, PTE-Br4 ) assemblies have perturbed optical properties. Additionally, the semi-classical Marcus theory of charge-transfer rates predicts a selective hole transport phenomenon in the orthogonally stacked PTE-Br2 . Precise rotation angle dependent optoelectronic properties in crystalline PTE-Br2 can have consequences in the rational design of novel π-conjugated materials for photonic and molecular electronic applications.

The Panax ginseng PgTIP1 gene confers enhanced salt and drought tolerance to transgenic soybean plants by maintaining homeostasis of water, salt ions and ROS

The Panax ginseng PgTIP1 gene has been demonstrated to have high water channel activity by its heterologous expression in Xenopus laevis oocytes and in yeast, and it also plays significant roles in enhancing the salt/drought tolerance of PgTIP1-transgenic Arabidopsis plants and salt adaptation of PgTIP1-transformed Glycine max. In this work, PgTIP1 gene was transformed into the hybrid soybean strain 4076 (F5), which was selected for salt tolerance generation by generation from the cross assembly of G. max N23674 cultivar × G. soja BB52 accession. The PgTIP1-transgenic soybean plants mediated by the pollen tube pathway, represented by lines L19 and L29, were simultaneously analyzed at physiological and molecular levels for enhanced salt and drought tolerance. The results showed that the salt-stressed PgTIP1-transgenic lines L19 and L29 acquired better leaf stomatal movement and water-gas exchange capacity; less absorption, transport and accumulation of Na+, Cl−; a lower Na+/K+ ratio; and enhanced antioxidase activities of SOD, POD, CAT, and APX than WT in the roots and leaves. Under PEG-induced drought stress, the PgTIP1-transgenic plants showed greater leaf water-retention capacity and reduced cell membrane damage in roots and leaves. Therefore, the PgTIP1-transgenic soybean lines showed both salt and drought tolerance, which are related not only to the primary functions of the PgTIP1 gene in terms of water status regulation but also to its secondary roles in up-regulating the expression of stress-related genes (GmNHX1, GmSOS1, GmCLC1, GmCAT1, GmAPX1, GmNCED1 and GmP5CS1), which are involved in homeostasis of Na+, K+, and Cl−; ROS scavenging; and synthesis of ABA, proline, etc.

E-Social work in practice: a case study

ABSTRACTThis paper presents a theoretical reflection on e-social work by considering a case study: an intervention programme with vulnerable people, included in the services catalogue of a non-governmental organization (NGO), Zaragoza Red Cross Assembly. This programme cares for older people with a home assistance system mediated by information and communication technologies (ICTs). The digital convergence of the Spanish Red Cross and the digitalization of internal processes were accelerated by the use of ICTs as a tool in the aftermath of the 2008 crisis: first, to manage bureaucratic matters; second, to coordinate professionals and third, to interact with users. The text is divided into five sections including an introduction and final remarks. The first section describes the intervention programme and its evolution from a traditional social work vision to an e-social work perspective. The second section describes and analyses the intervention programme and the incorporation of ICTs in this NGO, over more than two decades. The third section describes professional contributions to the implementation and adaptation of social work to new social and technological circumstances and users’ requirements based on these intervention experiences.

Uncertainty analysis of assembly and core-level calculations with application to CASMO-4E and SIMULATE-3

The topic of this paper is the development of sensitivity and uncertainty analysis capability to the CASMO-4/CASMO-4E – SIMULATE-3 code sequence in the context of the OECD/NEA benchmark ‘Uncertainty Analysis in Best-Estimate Modelling for Design, Operation and Safety Analysis of LWRs’ (UAM). The developed capability uses a two-step approach. In the first step, Uncertainties in nuclear data are propagated to two-group cross sections, diffusion coefficients, and assembly discontinuity factors. This is carried out using deterministic, perturbation-theory-based uncertainty analysis methodology. In the second step, a global covariance matrix, characterizing the uncertainties of the group constants, is formed, and the uncertainties are propagated through a full core SIMULATE calculation using a stochastic approach. This system enables the analysis of nuclear data related uncertainties in assembly-homogenized group constants, assembly discontinuity factors, and pin powers, as well as full core results such as multiplication factor and power distribution. The mathematical background of the deterministic uncertainty analysis methodology is reviewed and the main conclusions related to the implementation are summarized. Numerical results are presented for the full core Three Mile Island model in exercise I-3 of the UAM benchmark at hot zero power with all rods out and inserted. The computational efficiency of the calculations is discussed.

Structural effects of chirally mutated Enkephalin neurotransmitters: An argument for biological homochirality

In living organisms all peptides and proteins used endogenously are homochiral. However, heterochiral peptides, formed by post-translational modifications in some species, are used exclusively exogenously. These puzzling facts, accomplished at significant metabolic cost, are investigated here. A systematic study of the effect of chiral substitutions on structure and non-covalent interactions afforded by Ala(2)-Leu-Enkephalins by a combination of mass spectrometry/ion mobility spectrometry and techniques of computational chemistry is reported. The data show that chiral substitutions of amino acid residues have drastic consequences for peptide structure and their interactions as gauged by self- and cross assembly. Our data suggest that an organism based on homochiral polymers has a much higher evolvability than an organism based on heterochiral polymers.

Monte Carlo and nodal neutron physics calculations of the IAEA MTR benchmark using Serpent/DYN3D code system

As part of recent efforts to utilize NPPs computational methodologies to safety analysis of research reactors, the Serpent and DYN3D codes were extensively compared with a variety of static and burnup calculations as defined in the IAEA benchmark for 10 MW MTR pool-type reactor. These calculations include unit cell calculations and few group constants generation, unit cell and full core k-eigenvalue and burnup calculations, and full core 3D flux and power distributions. The Serpent code capabilities as a lattice code for MTR plate-type fuel assemblies were evaluated and compared with EPRI-CELL and WIMS-D4 results and reference solutions for full 3D core models were compared with MCNP5 and OpenMC results. The DYN3D nodal diffusion code capabilities in modeling full 3D MTR cores were also evaluated using few group cross sections and assembly discontinuity factors obtained by Serpent unit cell calculations. The DYN3D results were compared with Serpent, MCNP5 and OpenMC.

Build and Optimization Method of Embedded Cross Assembler

Build and Optimization Method of Embedded Cross Assembler

Automation and integration of multiplexed on-line sample preparation with capillary electrophoresis for high-throughput DNA sequencing.

An integrated and multiplexed on-line instrument starting from DNA templates to their primary sequences has been demonstrated based on multiplexed microfluidics and capillary array electrophoresis. The instrument automatically processes eight templates through reaction, purification, denaturation, preconcentration, injection, separation, and detection in a parallel fashion. A multiplexed freeze/thaw switching principle and a distribution network were utilized to manage flow and sample transportation. Dye-labeled terminator cycle-sequencing reactions are performed in an eight-capillary array in a hot-air thermal cycler. Subsequently, the sequencing ladders are directly loaded into separate size exclusion chromatographic columns operated at approximately 60 degrees C for purification. On-line denaturation and stacking injection for capillary electrophoresis is simultaneously accomplished at a cross assembly set at approximately 70 degrees C. Not only the separation capillary array but also the reaction capillary array and purification columns can be regenerated after every run. The raw data allow base calling up to 460 bp with an accuracy of 98%. The system is scalable to a 96-capillary array and will benefit not only high-speed, high-throughput DNA sequencing but also genetic typing.

Design and implementation of an EPROM emulator as a low-cost microprocessor development tool

This paper describes the design and use of an EPROM emulator as a low-cost microprocessordevelopment tool. In conjunction with cross assemblers and linkers, it allows executable code to be developed using a host PC, and to be directly executed by the target system. Unlike a microprocessor emulator, the EPROM emulator is flexible in that it can serve as a development tool for target systems based on a variety of microprocessors.

A generative approach to Universal Cross Assembler design

A new approach to Universal Cross Assembler design is proposed. New assemblers can be generated easily from the assembly language syntax, instruction set, addressing modes, binary code pattern of the instructions, directives, and the output file format. There are no constraints on the syntax, addressing modes, and instruction code lengths. It achieves high generality, extendibility and portability by considering assemblers as high level language compilers, using high level language development tools, YACC and LEX on UNIX. Using this approach, two prototype assemblers, one for 8086 and one for 68000, have been implemented on both UNIX and MSDOS. Their performance and comparison with existing assemblers are discussed in the paper.

PC/370 virtual machine

PC/370 Virtual Machine is a software package containing an IBM 370 cross assembler, linkage editor, and 370 emulator for use by students and programmers on any MS-DOS compatible PC such as the IBM PC, XT, or AT with 128K of memory. The software was originally developed in 1981 for CP/M-80 Z80 systems with 64K. (1) The cross assembler translates standard IBM 370 assembler into 370 relocatable object code. The linkage editor combines multiple 370 relocatable object modules into an executable load module file which dynamically loads the emulator at execution time. The emulator executes the standard 370 instruction set plus the packed decimal instruction set. In addition, the emulator supports extended architecture instructions, random and sequential file I/O, interactive debug, plus the extended instructions defined in ASSIST. (2) In 1985, the package was converted from Z80 macro assembler to 8086 macro assembler. This paper describes the conversion process and gives some benchmark data comparing performance of the original Z80 version and the 8086 version.

The design of an object oriented architecture

This paper proposes a new object model, called the distributed object model, wherein the model is unified as a protection unit, as a method of data abstraction, and as a computational unit, so as to realize reliable, maintainable, and secure systems. An object oriented architecture called ZOOM is designed based on this object model. A software simulator and cross assembler for this architecture have been implemented. The feasibility and performance of the architecture are discussed according to program sizes and estimated hardware size and execution speed.

Implementation of Task Coordinate Servoing System

This short paper describes the outline of a servo system for manipulators, recently developed at the Electrotechnical Laboratory. The servo system is implemented on a high speed micro-computer and capable of performing dynamics calculation and coordinate transformation of the manipulator in a cycle time for the servo (2.5 mili sec.) .Computation algorithms are formalized in vector form, and directly coded into programs, using vector macro language. The programs are expanded into assembly mnemonic form by macro processor. The mnemonic programs are converted into machine code by a cross assembler which runs on a host computer (VAX 11/780) . Then the machine code prograhi is downline loaded onto the realtime micro-computer (MIPROC-16) .In this servo system, controlled variables are arbitrarily chosen, and mode of control for each variable is also arbitrary. We can select the most suitable coordinate frame in order to do a task. For each motion component with respect to the coordinate frame, position, velocity, acceleration, force or compliance can be controlled. Using the servo system, sophisticated tasks such as parts mating or tool handling will be easily performed.

An LSI-11 Microcomputer Laboratory

This paper summarizes the design, development, and implementation of an eight station microcomputer laboratory based on the DEC LSI-11 processor. The objectives and requirements of the facility are outlined as background for understanding the system design. Other sections are devoted to hardware, software, and courseware development for the laboratory. Hardware includes the LSI-11 processor, 16 channels of A-D input (eight channels differential), two channels of analog output, a minifloppy disk drive, a CRT terminal, and serial data links to an IBM 370 system. Software includes a custom-built monitor for the LSI-11, a cross assembler, simulator, linker, and down-line loader which run on the IBM 370, and special A-D and D-A routines. Courseware includes ten self-paced laboratory exercises, five real-time monitoring and control experiments, and a series of TV tape cassettes. Hardware plans, software listings, and class materials are available to interested readers by writing to the authors.

Development of microprocesor in-service training courses

Under the aegis of the Department of Industry's Microprocessor Application Project, originated in 1978, the University of Salford has for two years been runing one of the most ambitious short course programmes associated with this scheme. The equipment used has been expanded from the basic single-board microprocessor systems, programmable only in hexadecimal machine code, which were initially used, to a full 15-station microprocessor development laboratory. Each station can make use of a range of software aids such as cross assemblers and cross-compilers hosted by the Electrical Engineering Department's Prime 550, and has access to ample hard-disk file storage. At the same time, each station can be used as a stand-alone basic development system for the more elementary courses. The Salford scheme includes several novel features in addition to the hardware. The basic scheme is modular in form, and extensions such as “workshop” courses and basic awareness courses held at outside venues are also offered. The latter have proved particularly popular. It has been found that courses must be continually improved and modified, and that new courses must be continually developed, to meet the rapidly-changing needs of industry.

Macro Implementation of a Structured Assembly Language

The feasibility of using macros to compile a linear assembly language is well established. A cross assembler has been implemented, via macros, for an assembly language, SCRAM, which embodies high-level language features such as user-controlled symbol scope and nested DO and IF/THEN/ELSE control structutes. Difficulties arose in implementation primarily from the inconvenience of managing assembly-time data

An LSI-11/Motorola Microcomputer Development System

A microcomputer development system was built using an RT-11 operating system and a cross assembler in developing a Motorola MC6801-L1 microcomputer-based stepping-motor controller to work with an LSI-11 host computer. The advantage of this technique is that we can use the familiar LSI-11 hardware and the powerful RT-11 operating system software for other microcomputer development. This paper describes how the technique works and its use in developing the stepping-motor controller.